V. L. Gein, L. F. Gein, E. P. Tsyplyakova and O. S. Panova, Synthesis of 6-Acyl-7-aryl-4,7-dihydrotetrazolo[1,5- a ]pyrimidine-5-carboxylic acids and their methyl esters, Volume 43, Number 9, 1382-1386
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http://dx.doi.org/10.1134/S1070428007090205