December 2018 (2) November 2018 (4) October 2020 (5) September 2020 (1) September 2021 (3) July 2020 (2), July 2021 (4), June 2021 (1), July 2019 (1″ June 2019 (3), May 2018 (6) April 2019 (4/4) March 2019 (2/3) February 2019 (5/2) January 2019 (7) December 2018 is December 20. May 2017 (7/7) April 2017 (8/10) April 2018 (9) March 2018 (8) February 2018 (1/10/11) January 2018 (10/12)”]
Source: https://blog.erratasec.com/2021/07/some-quick-notes-on-sdr.html