TY - JOUR AU - R. L. Stens AU - M. Wehrens TI - Legendre transform methods and best algebraic approximation JO - Commentationes Mathematicae PY - 1979 SP - 351 EP - 380 VL - 21 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v21i2.5996/ DO - 10.14708/cm.v21i2.5996 LA - pl ID - 10_14708_cm_v21i2_5996 ER -