[Alexander, P. D., Alloway, B. J., Dourado, A. M. (2006). Genotypic variations in the accumulation of Cd, Cu, Pb and Zn exhibited by six commonly grown vegetables. Environ. Pollut., 144 (3), 736–745.10.1016/j.envpol.2006.03.001]Search in Google Scholar
[Alvarez, J., Marco, L. M., Arroyo, J., Greaves, E. D., Rivas, R. (2003). Determination of calcium, potassium, manganese, iron, copper and zinc levels in representative samples of two onion cultivars using total reflection X-ray fluorescence and ultrasound extraction procedure. Spectrochim. Acta B, 58 (12), 2183–2189.10.1016/S0584-8547(03)00222-2]Search in Google Scholar
[Anonymous (2006). Setting maximum levels for certain contaminants in foodstuffs. EC Regulation 1881. Available from: http://eur-lex.europa.eu/legal-content/en/ALL/?uri=CELEX%3A32006R1881 (accessed 3 October 2016).]Search in Google Scholar
[Anonymous (2010). Action is needed on chemicals of major public health concern. WHO. Available from: http://www.who.int/ipcs/features/10chemicals_en.pdf (accessed 3 October 2016).]Search in Google Scholar
[Anonymous (2016). United States Department of Agriculture Agricultural Research Service National Nutrient Database for Standard Reference Release 28. Available from: https://ndb.nal.usda.gov/ndb/search/list (accessed 3 October 2016).]Search in Google Scholar
[Aras, N. K., Ataman, O. Y. (2006). Trace Element Analysis of Food and Diet. RSC Publishing, Cambridge. 344 pp.10.1039/9781847552495]Search in Google Scholar
[Chan, J., DuBois, B., Tidballd, K. G. (2015). Refuges of local resilience: Community gardens in post-Sandy New York City. Urban For. Urban Gree., 14 (3), 625–635.10.1016/j.ufug.2015.06.005]Search in Google Scholar
[Cosmulescu, S., Trandafir, I., Nour, V. (2015). Mineral composition of fruit in black and red currant. South Western J. Hortic., Biol. Environ., 6 (1), 43–51.]Search in Google Scholar
[Duboks, J. (2012). Dārzi un dārzkopība Rīgā: pilsētas zemes politikas un zaļo teritoriju attīstības iespējas [Gardens and Gardening in Riga: Development Opportunities of City Land Politics and Green Territories]. Bachelor Thesis. University of Latvia, Riga, Latvia (in Latvian). 113 lpp.]Search in Google Scholar
[Eggen, T., Moder, M., Arukwe, A. (2011). Emerging contaminants in consumer products: Environmental fate and transfer to human foodchain. In: Popov, V., Brebbia, C. A. (eds.). Food and Environment. WIT Press, Southampton, pp. 89–94.10.2495/FENV110091]Search in Google Scholar
[Ekholm, P., Reinivuo, H., Mattila, P., Pakkala, H., Koponen, J., Happonen, A., Hellström, J., Ovaskainen, M.-L. (2007). Changes in the mineral and trace element contents of cereals, fruits and vegetables in Finland. J. Food Comp. Anal., 20 (6), 487–495.10.1016/j.jfca.2007.02.007]Open DOISearch in Google Scholar
[Goldhaber, S. B. (2003). Trace element risk assessment: Essentiality vs. toxicity. Regul. Toxicol. Pharm., 38 (2), 232–242.10.1016/S0273-2300(02)00020-X]Search in Google Scholar
[Guitart, D., Pickering, C., Byrne, J. (2012). Past results and future directions in urban community gardens research. Urban For. Urban Gree., 4 (11), 364–373.10.1016/j.ufug.2012.06.007]Search in Google Scholar
[Izquierdo, M., De Miguel, E., Ortega, M. F., Mingot, O. (2015). Bioaccessibility of metals and human health risk assessment in community urban gardens. Chemosphere, 135, 312–318.10.1016/j.chemosphere.2015.04.07925966050]Search in Google Scholar
[Kabata-Pendias, A. (2011). Trace Elements in Soils and Plants. 4th ed. CRC Press, Boca Raton. 505 pp.]Search in Google Scholar
[Līventāls, T., Sadovskis, V. (red.) (1932). Rīga kā Latvijas galvaspilsēta [Rīga as a Capital City of Latvia]. Rīgas pilsētas valdes izdevums, Rīga. 638 lpp. (in Latvian).]Search in Google Scholar
[Rego, L. F. G. (2014). Urban vegetable production for sustainability: The Riortas Project in the city of Rio de Janeiro, Brazil. Habitat Int., 44, 510–516.10.1016/j.habitatint.2014.10.010]Open DOISearch in Google Scholar
[Reis, A. P., Patinha, C., Wragg, J., Dias, A. C., Cave, M., Sousa, A. J., Batista, M. J., Prazzeres, C., Costa, C., Ferreira da Silva, E., Rocha, F. (2013). Urban geochemistry of lead in gardens, playgrounds and schoolyards of Lisbon, Portugal: Assessing exposure and risk to human health. Appl. Geochem., 44, 45–53.10.1016/j.apgeochem.2013.09.022]Open DOISearch in Google Scholar
[Samsoe-Petersen, L., Larsen, E. H., Larsen, P. B., Bruun, P. (2002). Uptake of trace elements and PAHs by fruit and vegetables from contaminated soils. Environ. Sci. Technol., 36 (14), 3057–3063.10.1021/es015691t12141482]Search in Google Scholar
[Säumel, I., Kotsyuk, I., Hölscher, M., Lenkereit, C., Weber, F., Kowarik, I. (2012). How healthy is urban horticulture in high traffic areas? Trace metal concentrations in vegetable crops from plantings within inner city neighbourhoods in Berlin, Germany. Environ. Pollut., 165, 124–132.10.1016/j.envpol.2012.02.01922445920]Search in Google Scholar
[Soceanu, A., Dobrinas, S., Popescu, V., Birghila, S., Magearu, V. (2007). Comparative study of some essential elements in different types of vegetables and fruits. Environ. Eng. Manag. J., 6 (6), 593–596.10.30638/eemj.2007.075]Search in Google Scholar
[Vincevica-Gaile, Z. (2014). Impact of environmental conditions on microand macroelement content in selected food from Latvia. Doctoral Thesis, University of Latvia, Riga, Latvia. 180 lpp. Available from: https://dspace.lu.lv/dspace/handle/7/4931]Search in Google Scholar
[Vincevica-Gaile, Z., Klavins, M., Rudovica, V., Viksna, A. (2011). Trace and major elements in food articles in Latvia: Root vegetables. Sci. J. Riga Tech. U., Series: Environ. Climate Technol., 13 (7), 119–124.10.2478/v10145-011-0037-8]Search in Google Scholar
[Warming, M., Hansen, M. G., Holm, P. E., Magid, J., Thomas, H., Hansen, T. H., Trapp, S. (2015). Does intake of trace elements through urban gardening in Copenhagen pose a risk to human health? Environ. Pollut., 202, 17–23.10.1016/j.envpol.2015.03.01125796073]Search in Google Scholar
[Wunderlich, S., Feldman, C., Latif, K., Punamiya, P. (2011). Soil composition of community gardens: Are there quality concerns? In: Popov, V., Brebbia, C. A. (eds.). Food and Environment. WIT Press, Southampton, pp. 95–101.10.2495/FENV110101]Search in Google Scholar
[Zariņš, Z., Neimane, L. (2009). Uztura mācība [Nutrition Studies]. (5th ed.), LU Akadēmiskais apgāds, Rīga. 464 lpp. (in Latvian).]Search in Google Scholar