TY - JOUR AU - Zajíček, Luděk TI - On results of Jan Mařík in the theory of derivatives JO - Mathematica Bohemica PY - 1996 SP - 385 EP - 395 VL - 121 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/MB.1996.126042/ DO - 10.21136/MB.1996.126042 LA - en ID - 10_21136_MB_1996_126042 ER -