1. O. Martio, V. Ryazanov, U. Srebro, and E. Yakubov, “Mappings with finite length distortion,” J. Anal. Math., 93, 215–236 (2004).
2. O. Lehto and K. Virtanen, Quasiconformal Mappings in the Plane, Springer, New York (1973).
3. C. J. Bishop, V. Ya. Gutlyanskii, O. Martio, and M. Vuorinen, “On conformal dilatation in space,” Int. J. Math. Math. Sci., 22, 1397–1420 (2003).
4. Yu. F. Strugov, “Compactness of the classes of mappings quasiconformal in the mean,” Dokl. Akad. Nauk SSSR, 243, No. 4, 859–861 (1978).
5. O. Martio, S. Rickman, and J. Väisälä, “Topological and metric properties of quasiregular mappings,” Ann. Acad. Sci. Fenn., Ser. A1, 488, 1–31 (1971).