On the so-called “Palatini method” of variation in covariant gravitational theories
Annales de l'I.H.P. Physique théorique, Volume 18 (1973) no. 2, p. 121-135 
@article{AIHPA_1973__18_2_121_0,
     author = {El-Kholy, A. A. and Sexl, R. U. and Urbantke, H. K.},
     title = {On the so-called ``Palatini method'' of variation in covariant gravitational theories},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     publisher = {Gauthier-Villars},
     volume = {18},
     number = {2},
     year = {1973},
     pages = {121-135},
     language = {en},
     url = {http://www.numdam.org/item/AIHPA_1973__18_2_121_0}
}

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'I.H.P. Physique théorique, Volume 18 (1973) no. 2, pp. 121-135. http://www.numdam.org/item/AIHPA_1973__18_2_121_0/

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