@article{GDZPPN002224763,
title = {Sine - Laplace Equation, Sinh-Laplace Equation and Harmonic Maps.},
journal = {Manuscripta mathematica},
volume = {39},
year = {1982},
pages = {205-216},
zbl = {0511.35061},
url = {http://dml.mathdoc.fr/item/GDZPPN002224763}
}
Hesheng, Hu. Sine - Laplace Equation, Sinh-Laplace Equation and Harmonic Maps.. Manuscripta mathematica, Tome 39 (1982) pp. 205-216. http://gdmltest.u-ga.fr/item/GDZPPN002224763/