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Hall، G. G.؛ Lennard-Jones، J. (1950). "The Molecular Orbital Theory of Chemical Valency. III. Properties of Molecular Orbitals". Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences. ج. 202 ع. 1069: 155. Bibcode:1950RSPSA.202..155H. DOI:10.1098/rspa.1950.0091.