DerechV. D. “Structure of Finite Inverse Semigroup With Zero, in Which Every Stable Order Is Fundamental or Antifundamental”. Ukrains’kyi Matematychnyi Zhurnal 62, no. 1 (January 25, 2010): 29 - 39. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2841.