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The resultant wave functions are clearly dominated by the covalent (spin\u2010coupled) structures, with a negligible contribution from ionic structures. The orbitals obtained compare favorably with overlap enhanced atomic orbitals obtained by other valence bond approaches. The method is illustrated by calculations on water and dioxygen difluoride. \u00a9 1994 by John Wiley &amp; Sons, Inc.<\/jats:p>","DOI":"10.1002\/jcc.540151205","type":"journal-article","created":{"date-parts":[[2005,1,2]],"date-time":"2005-01-02T01:00:45Z","timestamp":1104627645000},"page":"1357-1364","source":"Crossref","is-referenced-by-count":14,"title":["A variational biorthogonal valence bond method"],"prefix":"10.1002","volume":"15","author":[{"given":"Nathaniel O. J.","family":"Malcolm","sequence":"first","affiliation":[]},{"given":"Joseph J. 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