@article{ZNSL_2008_353_a7,
     author = {A. M. Kuznetsov},
     title = {Visibility metrics on the boundary at infinity for the complex hyperbolic plane},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {70--92},
     publisher = {mathdoc},
     volume = {353},
     year = {2008},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2008_353_a7/}
}