@article{10_4064_am29_2_7,
     author = {V. Volpert and B. Ka/xmierczak and M. Massot and Z. Peradzy/nski},
     title = {Solvability conditions for elliptic problems
 with {non-Fredholm} operators},
     journal = {Applicationes Mathematicae},
     pages = {219--238},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {2002},
     doi = {10.4064/am29-2-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am29-2-7/}
}