@article{CMH_1987__62_140103,
     author = {Lee Rudolph},
     title = {Isolated critical points of mappings from {R4} to {R2} and a natural splitting of the {Milnor} number of a classical fibered link. {Part} {I:} {Basic} theory; examples.},
     journal = {Commentarii mathematici Helvetici},
     pages = {630--645},
     publisher = {mathdoc},
     volume = {62},
     year = {1987},
     zbl = {0626.57020},
     url = {http://geodesic.mathdoc.fr/item/CMH_1987__62_140103/}
}