@article{RM_1996_51_1_a13,
     author = {T. E. Panov},
     title = {On the structure of {a~Hopf} cohomology 2-algebra of four-dimensional manifolds},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {155--157},
     publisher = {mathdoc},
     volume = {51},
     number = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1996_51_1_a13/}
}