TY  - JOUR 
T1  - The nature of the chemical bond
JO  - Journal of the Brazilian Chemical Society
A1  - Nascimento, Marco Antonio Chaer
SN  - 0103-5053
UL  - 10.1590/S0103-50532008000200007
VL  - 19 
Y1  - 2008
PB  - Brasil 
ER  -