@article{AIHPA_1986__44_2_115_0,
     author = {Carminati, J. and McLenaghan, R. G.},
     title = {An explicit determination of the {Petrov} type {N} space-times on which the conformally invariant scalar wave equation satisfies {Huygens'} principle},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {115--153},
     publisher = {Gauthier-Villars},
     volume = {44},
     number = {2},
     year = {1986},
     mrnumber = {839281},
     zbl = {0595.35067},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1986__44_2_115_0/}
}