TY  - BOOK
TI  - Heterocyclic Compounds: edited by Robert C. Elderfield
U1  - 547.59 
PY  - 1957///
CY  - New York
PB  - John Wiley
N1  - Contents:V.6 six membered heterocycles containing two heteroatoms their benzo denratives. Elderfield, Robert C
ER  -