00290nam a2200109 a 450000500170000002000150001708200150003210000170004724500420006426000480010630000260015420251203110430.0  a0521530474  a541.2bSIM  aSimons, Jack  aIntroduction to Theoretical Chemistry  aCambridgebCambridge University Pressc2003  axiii,461p.c22 cm PB.