RomanivA. M., and ShchedrikV. P. “Greatest Common Divisor of Matrices One of Which Is a Disappear Matrix”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 66, no. 3, Mar. 2014, pp. 425–430, https://umj.imath.kiev.ua/index.php/umj/article/view/2145.