@article{DAN_1996_349_1_a15,
     author = {J. Seco Santos and A. Calvo Redondo and \`E. S. Kazimirovsky},
     title = {A generalization of {Ertel's} hydrodynamic theorem},
     journal = {Doklady Akademii Nauk},
     pages = {106--107},
     year = {1996},
     volume = {349},
     number = {1},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1996_349_1_a15/}
}