@article{NUMA_1982__39_132778,
     author = {C. Bernardi},
     title = {Approximation of {Hopf} {Bifurcation.}},
     journal = {Numerische Mathematik},
     pages = {15--38},
     publisher = {mathdoc},
     volume = {39},
     year = {1982},
     zbl = {0456.65034},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1982__39_132778/}
}