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"First and second extremal bipartite graphs with respect to PI index."
Zahra Yarahmadi, A. R. Ashrafi, Ivan Gutman (2011)
- Zahra Yarahmadi, A. R. Ashrafi
, Ivan Gutman
:
First and second extremal bipartite graphs with respect to PI index. Math. Comput. Model. 54(9-10): 2460-2463 (2011)

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