@article{M2AN_1980__14_1_43_0,
     author = {Kratochv{\'\i}l, Alexander and Ne\v{c}as, Jind\v{r}ich},
     title = {Gradient methods for the construction of {Ljusternik-Schnirelmann} critical values},
     journal = {RAIRO. Analyse num\'erique},
     pages = {43--54},
     publisher = {Centrale des revues, Dunod-Gauthier-Villars},
     address = {Montreuil},
     volume = {14},
     number = {1},
     year = {1980},
     mrnumber = {566089},
     zbl = {0431.65045},
     language = {en},
     url = {http://archive.numdam.org/item/M2AN_1980__14_1_43_0/}
}