00325nam a2200121Ia 4500008004100000040001600041041001200057082001700069100001700086245005700103260002800160300001500188230917s9999||||xx |||||||||||||| ||und||  e11913aMAIN  aEnglish  a541.28 R448Q  aRiggs, N .V. 0aQuantum chemistry: elementary principles and methods  aLondonbMacmillanc1969  aix,243p p.