Paper  bibtex   

@misc{bendin_beitrage_nodate,
	title = {Beiträge zur {Farbenlehre} - {Bendin}},
	url = {http://www.bendin-color.de/online-education/modul-%C3%BCbersicht/},
	language = {de},
	urldate = {2016-09-20TZ},
	author = {Bendin, Eckhard},
	keywords = {Wahrnehmung}
}