@article{MZ_1995__220_1_174802,
     author = {Fangyang Zheng},
     title = {First {Pontrjagin} form, rigidity and strong rigidity of nonpositively curved {K\"ahler} surface of general type.},
     journal = {Mathematische Zeitschrift},
     pages = {159--170},
     publisher = {mathdoc},
     volume = {220},
     number = {1},
     year = {1995},
     zbl = {0851.53042},
     url = {http://geodesic.mathdoc.fr/item/MZ_1995__220_1_174802/}
}