no. 2
An explicit determination of the Petrov type D spacetimes on which Weyl's neutrino equation and Maxwell's equations satisfy Huygens' principle
Annales de l'I.H.P. Physique théorique, Tome 53 (1990) no. 2, pp. 217-223. 
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     author = {McLenaghan, R. G. and Williams, G. C.},
     title = {An explicit determination of the {Petrov} type {D} spacetimes on which {Weyl's} neutrino equation and {Maxwell's} equations satisfy {Huygens'} principle},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {217--223},
     publisher = {Gauthier-Villars},
     volume = {53},
     number = {2},
     year = {1990},
     mrnumber = {1079778},
     zbl = {0709.53053},
     language = {en},
     url = {http://archive.numdam.org/item/AIHPA_1990__53_2_217_0/}
}
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McLenaghan, R. G.; Williams, G. C. An explicit determination of the Petrov type D spacetimes on which Weyl's neutrino equation and Maxwell's equations satisfy Huygens' principle. Annales de l'I.H.P. Physique théorique, Tome 53 (1990) no. 2, pp. 217-223. http://archive.numdam.org/item/AIHPA_1990__53_2_217_0/

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