@article{IM2_1968_2_4_a13,
     author = {P. S. Novikov and S. I. Adian},
     title = {Defining relations and the word problem for free periodic groups of odd order},
     journal = {Izvestiya. Mathematics},
     pages = {935--942},
     year = {1968},
     volume = {2},
     number = {4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1968_2_4_a13/}
}