DragomirS. S. “Operator Subadditivity of the D-Logarithmic Integral Transform for Positive Operators in Hilbert Spaces”. Annales Mathematicae Silesianae, Vol. 35, no. 2, May 2021, pp. 158-71, https://www.journals.us.edu.pl/index.php/AMSIL/article/view/13443.