BelousovK. I., NazarovaL. A., and RoiterA. V. “Finitely Represented $K$-Marked Quivers”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 53, no. 4, Apr. 2001, pp. 550-5, https://umj.imath.kiev.ua/index.php/umj/article/view/4276.