Darboux and Goursat type problems in the trihedral angle for hyperbolic type equations of third order Otari Jokhadze (1997) Rendiconti del Seminario Matematico della Università di Padova
Determination of point sources in vibrating beams by boundary measurements: Identifiability, stability, and reconstruction results. Nicaise, Serge, Zair, Ouahiba (2004) Electronic Journal of Differential Equations (EJDE) [electronic only]
Die Lösung der partiellen Differentialgleichung u x x t t = A ( t , x ) u x x + B ( t , x ) u t t mit gewissen Nebenbedingungen Věra Radochová (1973) Časopis pro pěstování matematiky