On approximation processes defined by a cosine operator function
Kivinukk, Andi
;
Saksa, Anna
;
Zeltser, Maria
Proceedings of the Estonian Academy of Sciences
2017
/
p. 214-224
https://doi.org/10.3176/proc.2017.2.11
http://www.ester.ee/record=b2355998*est
https://artiklid.elnet.ee/record=b2820949*est