@article{1103857445, author = {Folomeshkin, V. N.}, title = {The quadratic Lagrangians in general relativity}, journal = {Comm. Math. Phys.}, volume = {20}, number = {1}, year = {1971}, pages = { 115-120}, language = {en}, url = {http://dml.mathdoc.fr/item/1103857445} }
Folomeshkin, V. N. The quadratic Lagrangians in general relativity. Comm. Math. Phys., Tome 20 (1971) no. 1, pp. 115-120. http://gdmltest.u-ga.fr/item/1103857445/