@article{Frederiks:1999,
	author = {V. K. Frederiks},
	title = {Einstein's general principle of relativity},
	publisher = {Physics-Uspekhi},
	year = {1999},
	journal = {Phys. Usp.},
	volume = {42},
	number = {12},
	pages = {1235-1245},
	url = {https://ufn.ru/en/articles/1999/12/g/},
	doi = {10.1070/PU1999v042n12ABEH000749}
}