Navickis, Kazimieras. “Geometry of Non-Holonomic Complexes NGr (1, 4, 4) in a Four-Dimensional Affine Space ”. Lietuvos matematikos rinkinys 44, no. spec. (December 17, 2004): 202–205. Accessed May 20, 2024. https://www.journals.vu.lt/LMR/article/view/31923.