@article{01014292, title = {Harmonic maps over rings.}, journal = {Georgian Mathematical Journal}, volume = {4}, year = {1997}, pages = {41-64}, doi = {10.1023/A:1022112914382}, zbl = {0881.51002}, language = {en}, url = {http://dml.mathdoc.fr/item/01014292} }
Lashkhi, A. Harmonic maps over rings.. Georgian Mathematical Journal, Tome 4 (1997) pp. 41-64. doi : 10.1023/A:1022112914382. http://gdmltest.u-ga.fr/item/01014292/