@article{MABA_1988_2_3-4_a2,
     author = {B. Wegner},
     title = {A {Differential} {Geometric} {Proof} of the {Local} {Geometric} {Characterization} of {Spheres} and {Cylinders} by {Boas}},
     journal = {Mathematica balkanica},
     pages = {294},
     publisher = {mathdoc},
     volume = {2},
     number = {3-4},
     year = {1988},
     url = {http://geodesic.mathdoc.fr/item/MABA_1988_2_3-4_a2/}
}