AHMADINEZHAD, H., 2016. On conjugacy classes of the Klein simple group in Cremona group. Glasgow Mathematical Journal, DOI: 10.1017/S0017089516000239.
We consider countably many three-dimensional PSL2((Formula presented.) 7)-del Pezzo surface fibrations over ℙ1. Conjecturally, they are all irrational except two families, one of which is the product of a del Pezzo surface with ℙ1. We show that the other model is PSL2((Formula presented.) 7)-equivariantly birational to ℙ2×ℙ1. Based on a result of Prokhorov, we show that they are non-conjugate as subgroups of the Cremona group Cr3(ℂ).