@article{IM2_2008_72_3_a0,
     author = {V. K. Beloshapka and V. V. Ezhov and G. Schmalz},
     title = {Holomorphic classification of four-dimensional surfaces in~$\mathbb C^3$},
     journal = {Izvestiya. Mathematics },
     pages = {413--427},
     publisher = {mathdoc},
     volume = {72},
     number = {3},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2008_72_3_a0/}
}