@article{ZNSL_1997_236_a22,
     author = {A. V. Yakovlev},
     title = {Bilinear forms on categories},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {197--214},
     year = {1997},
     volume = {236},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1997_236_a22/}
}