@article{GDZPPN002095076,
title = {Rigidity of Certain Harmonic Mappings.},
journal = {Inventiones mathematicae},
volume = {55},
year = {1979},
pages = {297-307},
zbl = {0418.31005},
url = {http://dml.mathdoc.fr/item/GDZPPN002095076}
}
Sunada, Toshikazu. Rigidity of Certain Harmonic Mappings.. Inventiones mathematicae, Tome 55 (1979) pp. 297-307. http://gdmltest.u-ga.fr/item/GDZPPN002095076/