@article{AIF_2013__63_3_839_0,
     author = {Bi\'s, Andrzej},
     title = {An analogue of the {Variational} {Principle} for group and pseudogroup actions},
     journal = {Annales de l'Institut Fourier},
     pages = {839--863},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {63},
     number = {3},
     year = {2013},
     doi = {10.5802/aif.2778},
     zbl = {1294.37011},
     mrnumber = {3137474},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/aif.2778/}
}