TY - JOUR AU - Z. Ciesielski TI - On the spectrum of the Laplace operator JO - Commentationes Mathematicae PY - 1970 SP - 41 EP - 50 VL - 14 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.14708/cm.v14i1.5686/ DO - 10.14708/cm.v14i1.5686 LA - pl ID - 10_14708_cm_v14i1_5686 ER -