@article{RSMUP_1965__35_2_365_0,
     author = {Angotti, Rodney},
     title = {The projective invariants of the configuration of two lines and a third order differential element},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {365--370},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {35},
     number = {2},
     year = {1965},
     mrnumber = {211336},
     zbl = {0139.15103},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1965__35_2_365_0/}
}