The original version of this article Pavlov and Scholbach  included links which directed the reader to pirated content. The references that have been corrected are ⋯ 9. F. Borceux, Handbook of Categorical Algebra. 1, Encyclopedia of Mathematics and its Applications, Volume 50 (Cambridge University Press, Cambridge, 1994). 22. P. S. Hirschhorn, Model Categories and Their Localizations, Mathematical Surveys and Monographs, Volume 99 (American Mathematical Society, Providence, RI, 2003). 24. M. Hovey, Model Categories, Mathematical Surveys and Monographs, Volume 63 (American Mathematical Society, Providence, RI, 1999).