@article{10_4064_ap76_1_4,
     author = {Anna Cima and Armengol Gasull and Francesc Ma\~nosas},
     title = {A note on {LaSalle's} problems},
     journal = {Annales Polonici Mathematici},
     pages = {33--46},
     publisher = {mathdoc},
     volume = {76},
     number = {1-2},
     year = {2001},
     doi = {10.4064/ap76-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap76-1-4/}
}