## [1963 Study](https://www.sechistorical.org/collection/papers/1960/1963_SSMkt_Chapter_01_1.pdf) Gets into the [postwar changes](https://doi.org/10.1191/1464993404ps077pr). ## [2010 Amendments](https://www.sec.gov/files/litigation/litreleases/2010/34-61358.pdf) Ongoing [structural comments](https://www.sec.gov/comments/s7-02-10/s70210.shtml) thereto. ## [2013 Amendments](https://www.sec.gov/files/rules/proposed/2013/33-9416.pdf#page=113) Comments of [Commissioner Aguilar](https://web.archive.org/web/20141011024036/https://www.sec.gov/News/Speech/Detail/Speech/1370539684712#_edn23) from [note 14](https://www.sec.gov/newsroom/speeches-statements/2013-spch120513-2laa#_edn14).