@article{DAN_1986_289_2_a6,
     author = {S. P. Novikov and M. A. Shubin},
     title = {Morse inequalities and von {Neumann} $\mathrm{II}_1$-factors},
     journal = {Doklady Akademii Nauk},
     pages = {289--292},
     publisher = {mathdoc},
     volume = {289},
     number = {2},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1986_289_2_a6/}
}