@article{MZ_1991__207_2_174287,
     author = {Jerry L. Kazdan and Zhiren Jin},
     title = {On the rank of harmonic maps.},
     journal = {Mathematische Zeitschrift},
     pages = {535--538},
     publisher = {mathdoc},
     volume = {207},
     number = {2},
     year = {1991},
     zbl = {0717.31006},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__207_2_174287/}
}