1. J. C. Polking, ?A survey of removable singularities,? Semin. Nonlinear Partial Different. Equat., New York, 1984, pp. 261?292.
2. N. N. Tarkhanov, Laurent Series for Solutions to Elliptic Systems [in Russian], Nauka, Novosibirsk (1991).
3. N. S. Dairbekov, Properties of Solutions to Multidimensional Beltrami Equations [in Russian], Preprint Akad. Nauk SSSR Sibirsk. Otdel. Inst. Mat., Novosibirsk (1988).
4. A. P. Kopylov, Stability in theC-Norm of the Classes of Mappings [in Russian], Nauka, Novosibirsk (1990).
5. N. S. Dairbekov and A. P. Kopylov, ??-stability of the classes of mappings and systems of linear partial differential equations,? Sibirsk. Mat. Zh.,26, No. 2, 73?90 (1985).