The averaged moduli of smoothness /
Sendov, Blagovest.
Popov, Vasil A.(Vasil Atanasov)
Chichester [West Sussex] ; New York : Wiley,
c1988.
Translation of: Usredneni moduli na gladkost.
"A Wiley-Interscience publication."
Bibliography: p.
Smoothness of functions.