TY - JOUR AU - G. N. Yakovlev TI - Traces of functions in the space $W_p^l$ on piecewise smooth surfaces JO - Sbornik. Mathematics PY - 1967 SP - 481 EP - 497 VL - 3 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1967_3_4_a3/ LA - en ID - SM_1967_3_4_a3 ER -