Yesterday, VeloceToday featured a two-part article by Brandes Elitch on the Citroën SM. You can read part 1 here: https://www.velocetoday.com/remembering-the-citroen-sm-on-its-50th/
VT is a free weekly webzine, focused on French and Italian vehicles, that goes up with four new articles every Tuesday. Brandes has been writing a (mostly) monthly column there for about 12 years years.
Update – March 17, 2020 — Here is part 2: https://www.velocetoday.com/reflections-on-the-sm-part-2/