Lennard-Jones, J. E. (1934). "The electronic structure and the interaction of some simple radicals". Transactions of the Faraday Society. 30: 70–148. doi:10.1039/TF9343000070.
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. 202 (1069): 155. Bibcode:1950RSPSA.202..155H. doi:10.1098/rspa.1950.0091. S2CID97300916.
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. 202 (1069): 155. Bibcode:1950RSPSA.202..155H. doi:10.1098/rspa.1950.0091. S2CID97300916.
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. 202 (1069): 155. Bibcode:1950RSPSA.202..155H. doi:10.1098/rspa.1950.0091. S2CID97300916.