List of citations in Numdam for : 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
Annales de l'I.H.P. Physique théorique, Volume 54 (1991) no. 1, pp. 9-16.
Annales de l'I.H.P. Physique théorique, Volume 71 (1999) no. 6, pp. 595-620.
Annales de l'I.H.P. Physique théorique, Volume 60 (1994) no. 4, pp. 373-432.