@article{MM2_1990__66_1_155475,
     author = {Katsumi Nomizu and Takeshi Sasaki},
     title = {On a {Theorem} of {Chern} and {Terng} on {Affine} {Surfaces.}},
     journal = {Manuscripta mathematica},
     pages = {303--308},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1990},
     zbl = {0699.53008},
     url = {http://geodesic.mathdoc.fr/item/MM2_1990__66_1_155475/}
}