@article{10_21136_AM_1995_134301,
     author = {R\"oschel, Otto},
     title = {Double points on characteristics},
     journal = {Applications of Mathematics},
     pages = {381--390},
     year = {1995},
     volume = {40},
     number = {5},
     doi = {10.21136/AM.1995.134301},
     mrnumber = {1342367},
     zbl = {0842.53008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1995.134301/}
}