TY  - BOOK
AU  - Gupta, R R, Kumar, M & Gupta, V
TI  - Heterocyclic chemistry : principles, three - and four - membered heterocycles : vol. I
SN  - 81-8128-220-5
U1  - 547.59 Gup 
PY  - 1998///
CY  - Springer, New Delhi
ER  -