@article{10_5427_jsing_2014_10t,
     author = {Kazuto Takao},
     title = {Lips and swallow-tails of singularities of product maps},
     journal = {Journal of Singularities},
     pages = {286--295},
     publisher = {mathdoc},
     volume = {10},
     year = {2014},
     doi = {10.5427/jsing.2014.10t},
     url = {http://geodesic.mathdoc.fr/articles/10.5427/jsing.2014.10t/}
}