Geodesic
A Bound for the Degree of H 2(G, Zp )
Canadian journal of mathematics, Tome 26 (1974) no. 4, pp. 1010-1015

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Let G be a group and N a trivial G-module. We say an element ξ ∊ H 2 (G, N) is of degree ≦ n if a 2-cocycle representative of ξ is a polynomial 2-cocycle of degree ≦ n [1], Let PnH 2(G, N) denote the subgroup of H 2(G, N) consisting of elements with degree ≦ n. Then we have a nitration of H 2(G, N). We say that the degree of H 2(G, N) is ≦ n if PnH 2(G, N) = H 2(G, N). 
Sharma, Sneh. A Bound for the Degree of H 2(G, Zp ). Canadian journal of mathematics, Tome 26 (1974) no. 4, pp. 1010-1015. doi: 10.4153/CJM-1974-094-8
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