BelousovK. I., NazarovaL. A., RoiterA. V., and SergeychukV. V. “Elementary and Multielementary Representations of Vectroids”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 47, no. 11, Nov. 1995, pp. 1451–1477, https://umj.imath.kiev.ua/index.php/umj/article/view/5537.