@article{ZNSL_1999_261_a1,
     author = {Yu. I. Babenko},
     title = {Power invariants of joined coaxial prisms},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {31--39},
     year = {1999},
     volume = {261},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1999_261_a1/}
}