TY  - BOOK
AU  - Gupta, R. R.
AU  - Kumar, M
AU  - Gupta, V
TI  - Heterocyclic chemistry: principles, three-and four-membered heterocycles 
SN  - 9788181282200
U1  - 547.59 GUP-R 
PY  - 1998///
CY  - India
PB  - Springer
KW  - Heterocyclic chemistry
ER  -