@book{52781,
	author = {Lorentz, H. A.},
	title = {The Einstein Theory of Relativity: A Concise Statement},
	publisher = {Project Gutenberg,},
	year = {2004},
	address = {Salt Lake City, UT :},
	note = {Release date is 2004-02-01},
	url = {https://www.gutenberg.org/ebooks/11335}
}