@article{IM2_2009_73_4_a2,
     author = {S. Yu. Nemirovski},
     title = {Homology class of a {Lagrangian} {Klein} bottle},
     journal = {Izvestiya. Mathematics },
     pages = {689--698},
     publisher = {mathdoc},
     volume = {73},
     number = {4},
     year = {2009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2009_73_4_a2/}
}