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David C. Brydges, Jürg Fröhlich, Alan D. Sokal "A new proof of the existence and nontriviality of the continuum $\varphi^{4}_{2}$ and $\varphi^{4}_{3}$ quantum field theories," Communications in Mathematical Physics, Comm. Math. Phys. 91(2), 141-186, (1983)