S. Deser, and A. Starobinsky. (2011)cite arxiv:1110.5941Comment: Introduction to translation of Bronstein's original 1935 paper as a "Golden oldie", JGRG, Jan 2012.
B. Tinsley. (2022)cite arxiv:2203.02041Comment: This paper has been transcribed from a hard copy of Beatrice M. Tinsley's original manuscript into a digital file prepared by Michael J. Greener, a PhD student at the University of Nottingham. If you notice any errors or problems with this transcribed paper, please email Michael at either michael.greener@nottingham.ac.uk or mickgreener@protonmail.com. This version 2 includes a clearer Figure 6.
G. Hooft. (1998)cite arxiv:hep-th/9808154Comment: small but important corrections were made as a response to several reactions. Minor typos corrected. 17 pages plain TeX, 4 figures PostScript.