@article{MZM_1999_66_1_a14,
     author = {A. E. Ruuge},
     title = {Variational principle for semiclassical fermions},
     journal = {Matemati\v{c}eskie zametki},
     pages = {154--156},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1999_66_1_a14/}
}