@article{RM_1996_51_4_a4,
     author = {V. M. Buchstaber and E. G. Rees},
     title = {Multivalued groups and {Hopf} $n$-algebras},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {727--729},
     publisher = {mathdoc},
     volume = {51},
     number = {4},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1996_51_4_a4/}
}