TY  - BOOK
AU  - Katritzky,Alan R., Lagowksi, J. M.
AU  - x
TI  - The principles of heterocyclic chemistry : x 
SN  - x   
U1  - 547.59/KAP  
PY  - 1967///
CY  - London 
PB  - Methuen 
KW  - Chemistry, organic
KW  - Chemistry
N1  - Includes
ER  -