Ballard, R. E. Photoelectron spectroscopy and molecular orbital theory / R. E. Ballard. - Bristol [Eng.] : A. Hilger, c1978. - ix, 192 p. : ill. ; 25 cm. ISBN: 0852743416 Subjects--Index Terms: Photoelectron spectroscopy Molecular orbitals. Dewey Class. No.: 541/.22 / BAL