Geodesic
A~condition for quasiconformality
Matematičeskie zametki, Tome 9 (1971) no. 6, pp. 663-666.

Voir la notice de l'article provenant de la source Math-Net.Ru

A necessary and sufficient condition is found for a homeomorphism of a region $G\subset C$ into the complex plane $C$ to be $K$-quasiconformal. 
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     author = {S. P. Ponomarev},
     title = {A~condition for quasiconformality},
     journal = {Matemati\v{c}eskie zametki},
     pages = {663--666},
     publisher = {mathdoc},
     volume = {9},
     number = {6},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_6_a5/}
}
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S. P. Ponomarev. A~condition for quasiconformality. Matematičeskie zametki, Tome 9 (1971) no. 6, pp. 663-666. http://geodesic.mathdoc.fr/item/MZM_1971_9_6_a5/