@article{SM_1999_190_9_a4,
     author = {\`E. \`E. Shnol' and E. V. Nikolaev},
     title = {On the bifurcations of equilibria corresponding to double eigenvalues},
     journal = {Sbornik. Mathematics},
     pages = {1353--1376},
     publisher = {mathdoc},
     volume = {190},
     number = {9},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1999_190_9_a4/}
}