AHMED SALEM, A CERTAIN CLASS OF APPROXIMATIONS FOR THE 𝑞-DIGAMMA FUNCTION, The Rocky Mountain Journal of Mathematics, Vol. 46, No. 5 (2016), pp. 1665-1677 ...

Also, in this article, we deepen further in another way into the structure of the classes of matrix monotone functions and of the gaps between them by considering the problem of position in the gaps ...