An integral operator representation of classical periodic pseudodifferential operators. Vainikko, G. — 1999 Zeitschrift für Analysis und ihre Anwendungen
Fast solution of periodic integral equations by GMRES. Plato, R.; Vainikko, G. — 2001 Computational Methods in Applied Mathematics
On the Regularization of Projection Methods for Solving Ill-Posed Problems. R. Plato; G. Vainikko — 1990 Numerische Mathematik