@article{MZ_1980__173_172973,
     author = {Francesco Mercuri and Yuriko Y. Baldin},
     title = {Isometric {Immersions} in {Codimesion} {Two} with {Non} {Negative} {Curvature.}},
     journal = {Mathematische Zeitschrift},
     pages = {111--118},
     publisher = {mathdoc},
     volume = {173},
     year = {1980},
     zbl = {0417.53032},
     url = {http://geodesic.mathdoc.fr/item/MZ_1980__173_172973/}
}