1. Van Nostrand Mathematical Studies, No. 10;Ahlfors, Lars V.,1966
2. Global invertibility of Sobolev functions and the interpenetration of matter;Ball, J. M.;Proc. Roy. Soc. Edinburgh Sect. A,1981
3. Homeomorphic solutions of Beltrami systems;Boyarskiĭ, B. V.;Dokl. Akad. Nauk SSSR (N.S.),1955
4. Generalized solutions of a system of differential equations of first order and of elliptic type with discontinuous coefficients;Boyarskiĭ, B. V.;Mat. Sb. N.S.,1957
5. Analytical foundations of the theory of quasiconformal mappings in 𝑅ⁿ;Bojarski, B.;Ann. Acad. Sci. Fenn. Ser. A I Math.,1983