no. 2
On the so-called “Palatini method” of variation in covariant gravitational theories
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 18 (1973) no. 2, pp. 121-135 
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     author = {El-Kholy, A. A. and Sexl, R. U. and Urbantke, H. K.},
     title = {On the so-called {{\textquotedblleft}Palatini} method{\textquotedblright} of variation in covariant gravitational theories},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {121--135},
     year = {1973},
     publisher = {Gauthier-Villars},
     volume = {18},
     number = {2},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1973__18_2_121_0/}
}
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El-Kholy, A. A.; Sexl, R. U.; Urbantke, H. K. On the so-called “Palatini method” of variation in covariant gravitational theories. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 18 (1973) no. 2, pp. 121-135. https://www.numdam.org/item/AIHPA_1973__18_2_121_0/

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