00266nam a2200109 a 450000500170000002000150001708200210003210000190005324500280007226000390010030000170013920251203091516.0  a0632016213  a541.224,bD, web  aWebster, Brian  aChemical bonding theory  aOxfordbBlackwell Scientificc1990  ax,276p, 23cm