TY - JOUR AU - Andi Kivinukk AU - Anna Ĺ eletskia TI - On the Steklov averages in operator cosine function framework JO - Filomat PY - 2023 SP - 1635 VL - 37 IS - 5 UR - http://geodesic.mathdoc.fr/articles/10.2298/FIL2305635K/ DO - 10.2298/FIL2305635K LA - en ID - 10_2298_FIL2305635K ER -