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- [34] Constraint analysis of two-dimensional quadratic gravity from BF\documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$${ BF}$$\end{document} theory General Relativity and Gravitation, 2017, 49 (1)