@article{LJM_2006_22_a4,
     author = {A. V. Lapteva and E. I. Yakovlev},
     title = {Index vector-function and minimal cycles},
     journal = {Lobachevskii journal of mathematics},
     pages = {35--46},
     publisher = {mathdoc},
     volume = {22},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/LJM_2006_22_a4/}
}