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"The PI index of product graphs."
Hassan Yousefi-Azari, B. Manoochehrian, A. R. Ashrafi (2008)
- Hassan Yousefi-Azari, B. Manoochehrian, A. R. Ashrafi:
The PI index of product graphs. Appl. Math. Lett. 21(6): 624-627 (2008)
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