@article{1103840013,
author = {Beiglb\"ock, W.},
title = {The center-of-mass in Einstein's theory of gravitation},
journal = {Comm. Math. Phys.},
volume = {4},
number = {1},
year = {1967},
pages = { 106-130},
language = {en},
url = {http://dml.mathdoc.fr/item/1103840013}
}
Beiglböck, W. The center-of-mass in Einstein's theory of gravitation. Comm. Math. Phys., Tome 4 (1967) no. 1, pp. 106-130. http://gdmltest.u-ga.fr/item/1103840013/