TY  - BOOK
AU  - Kuznetsov,V.I.
TI  - Theory of valency in progress / 
U1  - 541.224 
PY  - 1980///
CY  - Moscow
PB  - MIR, 
KW  - Chemistry
KW  - Evolution
KW  - Chemical bonds
KW  - Molecules
ER  -