@article{10_4153_CJM_1966_052_4,
     author = {Gr\"unbaum, Branko},
     title = {Continuous {Families} of {Curves}},
     journal = {Canadian journal of mathematics},
     pages = {529--537},
     year = {1966},
     volume = {18},
     number = {1},
     doi = {10.4153/CJM-1966-052-4},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1966-052-4/}
}