@article{1103815047,
author = {Pechlaner, E. and Sexl, R.},
title = {On quadratic Lagrangians in general relativity},
journal = {Comm. Math. Phys.},
volume = {1},
number = {5},
year = {1966},
pages = { 165-175},
language = {en},
url = {http://dml.mathdoc.fr/item/1103815047}
}
Pechlaner, E.; Sexl, R. On quadratic Lagrangians in general relativity. Comm. Math. Phys., Tome 1 (1966) no. 5, pp. 165-175. http://gdmltest.u-ga.fr/item/1103815047/