On periodic solutions of some equations of mathematical physics Marie Kopáčková (1973) Aplikace matematiky
On the numerical solution of fractional hyperbolic partial differential equations. Ashyralyev, Allaberen, Dal, Fadime, Pinar, Zehra (2009) Mathematical Problems in Engineering
On the solution sets of some nonconvex hyperbolic differential inclusions Francesco S. de Blasi, Giulio Pianigiani, Vasile Staicu (1995) Czechoslovak Mathematical Journal