TY - JOUR AU - Jerzy Łoś TI - Characteristic sets of a system of equivalence relations JO - Colloquium Mathematicum PY - 1979 SP - 291 EP - 293 VL - 42 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.4064/cm-42-1-291-293/ DO - 10.4064/cm-42-1-291-293 LA - en ID - 10_4064_cm_42_1_291_293 ER -