@article{CM_1991__78_2_193_0,
     author = {Coppens, Marc and Martens, Gerriet},
     title = {Secant spaces and {Clifford's} theorem},
     journal = {Compositio Mathematica},
     pages = {193--212},
     publisher = {Kluwer Academic Publishers},
     volume = {78},
     number = {2},
     year = {1991},
     mrnumber = {1104787},
     zbl = {0741.14035},
     language = {en},
     url = {http://www.numdam.org/item/CM_1991__78_2_193_0/}
}