Published Online: Dec 31, 2018
Page range: 34 - 37a
DOI: https://doi.org/10.2478/disp-1999-0004
© 2019 Leonidas Hegenberg, published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.
Leonidas Hegenberg
Professor Jubilado, Rua Lisboa 1208, 05.413-001,S. Paulo – SP, Brasil