Klyuev, V. V., and Kоkоvkіn-Shcherbak N. I. 1966. “On the Minimization of the Number of Arithmetical Operation With One Transformation of Matrices”. Ukrains’kyi Matematychnyi Zhurnal 18 (6): 122-28. https://umj.imath.kiev.ua/index.php/umj/article/view/8468.