@article{VUU_2009_2_a5,
     author = {N. V. Lyubashevskaya and A. P. Chupakhin},
     title = {Basis of differential invariants of symmetry group of {Green--Naghdi} equations},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {52--62},
     publisher = {mathdoc},
     number = {2},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2009_2_a5/}
}