@article{MM2_1992__76_1_155752,
     author = {Andr\'as Sz\"ucs},
     title = {Note on double points of immersions.},
     journal = {Manuscripta mathematica},
     pages = {251--256},
     publisher = {mathdoc},
     volume = {76},
     number = {1},
     year = {1992},
     zbl = {0776.57017},
     url = {http://geodesic.mathdoc.fr/item/MM2_1992__76_1_155752/}
}