ABSTRACT
Agranovich, M. (1965), Elliptic singular integro-differential operators, Uspekhi Matem. Nauk 20(5), 3-120.
Agranovich, M. (1997), Elliptic boundary problems, in Partial Differential Equations IX. Elliptic Boundary Value Problems, Agranovich, M., Egorov, Yu. and Shubin, M., Eds., Vol. 60 of Encyclopaedia of Mathematical Sciences, Springer-Verlag, Berlin-Heidelberg, 1-144.
