@article{AIHPA_1987__47_4_337_0,
     author = {Carminati, J. and McLenaghan, R. G.},
     title = {An explicit determination of the space-times on which the conformally invariant scalar wave equation satisfies {Huygens'} principle. - {Part} {II} : {Petrov} type {D} space-times},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {337--354},
     publisher = {Gauthier-Villars},
     volume = {47},
     number = {4},
     year = {1987},
     zbl = {0694.35074},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1987__47_4_337_0/}
}