@book{111519,
	author = {Freundlich, Erwin, and Einstein, Albert,},
	title = {The foundations of Einstein's theory of gravitation},
	publisher = {Project Gutenberg,},
	year = {2023},
	address = {Salt Lake City, UT :},
	note = {Release date is 2023-05-18},
	url = {https://catalog.hathitrust.org/Record/001987666}
}