TY - JOUR AU - P.N. Natarajan TI - The Schur and Steinhaus Theorems for 4-Dimensional Infinite Matrices JO - Commentationes Mathematicae PY - 2014 SP - 159 EP - 165 VL - 54 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v54i2.698/ DO - 10.14708/cm.v54i2.698 LA - pl ID - 10_14708_cm_v54i2_698 ER -