Khan, M. S. “Existence of the Category $DTC_2 (K)$ Equivalent to the Given Category $KAC_2$”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 67, no. 8, Aug. 2015, pp. 1122–1133, https://umj.imath.kiev.ua/index.php/umj/article/view/2050.