E. Ballico, R. Notari, y M. L. Spreafico, «Ropes on a line embedded in a Grassmannian variety»., Rev. mat. complut., vol. 17, n.º 1, pp. 181–193, jun. 2004, doi: https://doi.org/10.5209/rev_REMA.2004.v17.n1.16799