@article{RM_1999_54_6_a5,
     author = {M. Deza and M. I. Shtogrin},
     title = {Primitive polycycles and helicenes},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1238--1239},
     year = {1999},
     volume = {54},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1999_54_6_a5/}
}