Integral equations : a reference text / [by] P.P. Zabreyko, A.I. Koshelev ... [et al.] ; transl. and edited by T.O. Shaposhnikova, R.S. Anderssen and S.G. MikhlinApproximation on a rectangular grid : with application to finite element methods and other problems / S. G. Mikhlin ; transl. [from the Russian] and ed. by R. S. Anderssen and T. O. Shaposhnikova