On a cosine operator function framework of approximation processes in banach spaceKivinukk, Andi; Saksa, Anna; Zeltser, MariaFilomat2019 / p. 4213-4228 https://doi.org/10.2298/FIL1913213K Journal metrics at Scopus Article at Scopus Journal metrics at WOS Article at WOS

Siinustest ja koosinustest :[vestlus matemaatik T. Arakuga]Arak, TaivoRahva Hääl1984 / lk. [?] https://www.ester.ee/record=b1072826*est