Não informado. (1968). Journal of Approximation Theory. Academic Press.
Chicago-viite (17. p.)Não informado. Journal of Approximation Theory. San Diego, Calif: Academic Press, 1968.
MLA-viite (8. p.)Não informado. Journal of Approximation Theory. Academic Press, 1968.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.