A weak Q-Fano threefold of Picard rank two has anticanonical volume at most 72, except in one subcase, with equality only for the projective bundle P(O⊕O(3)) over P^2.
Hacon, and James McKernan
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On anticanonical volumes of weak $\mathbb{Q}$-Fano terminal threefolds of Picard rank two
A weak Q-Fano threefold of Picard rank two has anticanonical volume at most 72, except in one subcase, with equality only for the projective bundle P(O⊕O(3)) over P^2.