@article{10_1017_S0017089500032080,
     author = {Chiappinelli, Raffaele},
     title = {An estimate on the eigenvalues in bifurcation for gradient mappings},
     journal = {Glasgow mathematical journal},
     pages = {211--216},
     year = {1997},
     volume = {39},
     number = {2},
     doi = {10.1017/S0017089500032080},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500032080/}
}