Global existence for a hyperbolic integrodifferential inverse problem. Jaan Janno — 1996 Forum mathematicum
Recovering a time- and space-dependent kernel in a hyperbolic integro-differential equation from a restricted Dirichlet-to-Neumann operator. Janno, Jaan — 2004 Electronic Journal of Differential Equations (EJDE) [electronic only]
Identification of two degenerate time- and space-dependent kernels in a parabolic equation. Pais, Enno; Janno, Jaan — 2005 Electronic Journal of Differential Equations (EJDE) [electronic only]