@article{ZNSL_2008_358_a11,
     author = {V. Kreinovich and M. Margenstern},
     title = {In some curved spaces, one can solve {NP-hard} problems in polynomial time},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {224--250},
     publisher = {mathdoc},
     volume = {358},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2008_358_a11/}
}