[1. Wright, J.: Chemistry and Industry 1963, 1125.]Search in Google Scholar
[2. Laurene, A. H., Cundiff, R. H., and Greene, G. H.: Tobacco Science 9 (1.965) 1. ]Search in Google Scholar
[3. Cundiff, R. H., Greene, G. H., and Laurene, A. H.: Tobacco Science 8 (1964) 163. ]Search in Google Scholar
[4. Giles, J. A., and Cundiff, R. H.: Journal of the AOAC 52 (1969) 753· ]Search in Google Scholar
[5. Slanski, J. M., and Moshy, R. J.: Journal of Chromatography 35 (1968) 94·10.1016/S0021-9673(01)82354-2]Search in Google Scholar
[6. Sharkey, A. S., Jr., Friedel, R. A., and Langer, S. H.: Anal. Chem. 29 (1957) 770. 10.1021/ac60125a009]Search in Google Scholar
[7. Diekman, J., Thomson,]: B., and Djerassi, C.: J. Org. Chem. 33 (1968) 2271.]Search in Google Scholar
[8. Gelding, B. T., Rickards, R. W., and Barber, M.: Tetrahedron Letters 1964, 261510.1016/S0040-4039(00)70396-0]Search in Google Scholar