On a Darboux problem for a third-order hyperbolic equation with multiple characteristics. Jokhadze, O. — 1995 Georgian Mathematical Journal
Spatial problem of Darboux type for one model equation of third order. Jokhadze, O. — 1996 Georgian Mathematical Journal
On the boundary value problem in a dihedral angle for normally hyperbolic systems of first order. Jokhadze, O. — 1998 Georgian Mathematical Journal