@article{MZ_1986__192_173761,
     author = {O. Kowalski and L. Vanhecke},
     title = {A {New} {Formula} for the {Shape} {Operator} of a {Geodesic} {Sphere} and {Its} {Applications.}},
     journal = {Mathematische Zeitschrift},
     pages = {613--626},
     publisher = {mathdoc},
     volume = {192},
     year = {1986},
     zbl = {0596.53017},
     url = {http://geodesic.mathdoc.fr/item/MZ_1986__192_173761/}
}