Reference [1] in my previous message should have been: https://doi.org/10.1145/365696.365702

[1] http://doi.acm.org/10.1145/365696.3657022
[2] http://doi.acm.org/10.1145/2786.2789
[3] http://www.softwarepreservation.org/projects/ALGOL/standards/.