Dasari, N. V. K., and J. Kabat. “Several Observations about Maneeals - a Peculiar System of Lines”. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, vol. 15, Dec. 2016, pp. 51-68, https://studmath.uken.krakow.pl/article/view/13142.