@book{107766,
	author = {Einstein, Albert, and Minkowski, H.},
	title = {The Principle of Relativity},
	publisher = {Project Gutenberg,},
	year = {2021},
	address = {Salt Lake City, UT :},
	note = {Release date is 2021-12-14},
	url = {https://www.gutenberg.org/ebooks/66944}
}