Regularity results for semilinear and geometric wave equations Jalal Shatah — 1997 Banach Center Publications
Decay estimates for the critical semilinear wave equation Hajer Bahouri; Jalal Shatah — 1998 Annales de l'I.H.P. Analyse non linéaire
Harmonic maps of the hyperbolic space and development of singularities in wave maps and Yang-Mills fields Thierry Cazenave; Jalal Shatah; A. Shadi Tahvildar-Zadeh — 1998 Annales de l'I.H.P. Physique théorique