@article{VUU_2008_3_a1,
     author = {A. P. Karpova and Yu. I. Sapronov},
     title = {Approximate calculation of amplitudes of cycles bifurcating in the presence of resonances},
     journal = {Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹ\^uternye nauki},
     pages = {12--22},
     publisher = {mathdoc},
     number = {3},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VUU_2008_3_a1/}
}