@article{AIHPA_1999__70_3_259_0,
     author = {Anderson, W. G. and McLenaghan, R. G. and Sasse, F. D.},
     title = {Huygens' principle for the non-self-adjoint scalar wave equation on {Petrov} type {III} space-times},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {259--276},
     publisher = {Gauthier-Villars},
     volume = {70},
     number = {3},
     year = {1999},
     mrnumber = {1718182},
     zbl = {0956.83005},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1999__70_3_259_0/}
}