TY - JOUR AU - Sergio Segura de León TI - Bukhvalov type characterizations of Urysohn operators JO - Studia Mathematica PY - 1991 SP - 199 EP - 220 VL - 99 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.4064/sm-99-3-199-220/ DO - 10.4064/sm-99-3-199-220 LA - en ID - 10_4064_sm_99_3_199_220 ER -