TY - JOUR AU - Porubský, Štefan TI - Covering systems, Kubert identities and difference equations JO - Mathematica slovaca PY - 2000 SP - 381 EP - 413 VL - 50 IS - 4 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/MASLO_2000__50_4_a2/ LA - en ID - MASLO_2000__50_4_a2 ER -