Ostrovsky, V.L., and S.D. Silvestrov. “Representations of the Real Forms of Calibrated Analogue of the Lie Algebra ”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 11 (November 6, 1992): 1518–1524. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/8254.