@article{IM_1977__39_142463,
     author = {J. Guckenheimer},
     title = {On the {Bifurcation} of {Maps} of the {Interval}},
     journal = {Inventiones mathematicae},
     pages = {165--178},
     publisher = {mathdoc},
     volume = {39},
     year = {1977},
     zbl = {0354.58013},
     url = {http://geodesic.mathdoc.fr/item/IM_1977__39_142463/}
}