@article{10_4153_CJM_1969_059_1,
     author = {Zamfirescu, Tudor},
     title = {On {Planar} {Continuous} {Families} of {Curves}},
     journal = {Canadian journal of mathematics},
     pages = {513--530},
     year = {1969},
     volume = {21},
     number = {1},
     doi = {10.4153/CJM-1969-059-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1969-059-1/}
}