Warchol, Mark P.; DiCarlo, E.N.; Maryanoff, Cynthia A.; Mislow, Kurt (1975). "Evidence for the contribution of the lone pair to the molecular dipole moment of triarylphosphines". Tetrahedron Letters. 16 (11): 917–920. doi:10.1016/S0040-4039(00)72019-3. ISSN0040-4039.
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Warchol, Mark P.; DiCarlo, E.N.; Maryanoff, Cynthia A.; Mislow, Kurt (1975). "Evidence for the contribution of the lone pair to the molecular dipole moment of triarylphosphines". Tetrahedron Letters. 16 (11): 917–920. doi:10.1016/S0040-4039(00)72019-3. ISSN0040-4039.