@article{AIHPA_1991__54_1_9_0,
     author = {Carminati, J. and Czapor, S. R. and McLenaghan, R. G. and Williams, G. C.},
     title = {Consequences of the validity of {Huygens'} principle for the conformally invariant scalar wave equation, {Weyl's} neutrino equation and {Maxwell's} equations on {Petrov} type {II} space-times},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {9--16},
     publisher = {Gauthier-Villars},
     volume = {54},
     number = {1},
     year = {1991},
     mrnumber = {1102968},
     zbl = {0729.35075},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1991__54_1_9_0/}
}