Ameur, Y., Jser, S. K., & Strov, S. S. (2006). Interpolation Classes, Operator and Matrix Monotone Functions. Proceedings of the Estonian Academy of Sciences. Physics, Mathematics, 55(3), 141-145. https://www.airitilibrary.com/Article/Detail?DocID=14060086-200609-201011080017-201011080017-141-145