@article{CM_1967__18_3_189_0,
     author = {Leland, Kenneth O.},
     title = {Topological analysis of differentiable transformations},
     journal = {Compositio Mathematica},
     pages = {189--200},
     publisher = {P. Noordhoff N. V., Groningen},
     volume = {18},
     number = {3},
     year = {1967},
     mrnumber = {222312},
     zbl = {0174.12802},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1967__18_3_189_0/}
}