@article{GDZPPN002226057, title = {Line Fields with Branch Defects.}, journal = {Manuscripta mathematica}, volume = {46}, year = {1984}, pages = {297-300}, zbl = {0588.55014}, url = {http://dml.mathdoc.fr/item/GDZPPN002226057} }
Jänich, Klaus. Line Fields with Branch Defects.. Manuscripta mathematica, Tome 46 (1984) pp. 297-300. http://gdmltest.u-ga.fr/item/GDZPPN002226057/