@article{1103940286,
author = {Jonker, Leo and Rand, David A.},
title = {Universal properties of maps of the circle with $\varepsilon $-singularities},
journal = {Comm. Math. Phys.},
volume = {88},
number = {2},
year = {1983},
pages = { 273-292},
language = {en},
url = {http://dml.mathdoc.fr/item/1103940286}
}
Jonker, Leo; Rand, David A. Universal properties of maps of the circle with $\varepsilon $-singularities. Comm. Math. Phys., Tome 88 (1983) no. 2, pp. 273-292. http://gdmltest.u-ga.fr/item/1103940286/