TY - JOUR AU - F. Filipczak TI - On some Marcus problem concerning functions possessing the derivative at points of discontinuity only JO - Fundamenta Mathematicae PY - 1980 SP - 217 EP - 228 VL - 109 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/fm-109-3-217-228/ DO - 10.4064/fm-109-3-217-228 LA - en ID - 10_4064_fm_109_3_217_228 ER -