We investigate the approximation of analytic functions of several variables in polydiscs by the sequences of linear k-positive operators in the Gadjiev sense.
"Approximation of analytic functions of severalvariables by linear k-positive operators,"
Turkish Journal of Mathematics: Vol. 41:
2, Article 19.
Available at: https://journals.tubitak.gov.tr/math/vol41/iss2/19