@article{10_1017_S0017089500031852,
     author = {Jelonek, W{\l}odzimierz},
     title = {Characterization of affine ruled surfaces},
     journal = {Glasgow mathematical journal},
     pages = {17--20},
     year = {1997},
     volume = {39},
     number = {1},
     doi = {10.1017/S0017089500031852},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500031852/}
}