@article{BAG_1989__29_138448,
     author = {A. Florian},
     title = {Approximation of spherical caps by polygons},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {171--182},
     publisher = {mathdoc},
     volume = {29},
     year = {1989},
     url = {http://geodesic.mathdoc.fr/item/BAG_1989__29_138448/}
}