TY - JOUR AU - Vagn Lundsgaard Hansen TI - The Magic World of Geometry - I. The Isoperimetric Problem. JO - Elemente der Mathematik PY - 1994 SP - 61 EP - 65 VL - 49 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ELMA_1994__49_1_141558/ ID - ELMA_1994__49_1_141558 ER -