On a cosine operator function framework of approximation processes in banach space
Kivinukk, Andi
;
Saksa, Anna
;
Zeltser, Maria
Filomat
2019
/
p. 4213-4228
https://doi.org/10.2298/FIL1913213K
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Siinustest ja koosinustest :[vestlus matemaatik T. Arakuga]
Arak, Taivo
Rahva Hääl
1984
/
lk. [?]
https://www.ester.ee/record=b1072826*est