I was contacted by someone who wanted to read my old catamorphism knol, despite the fact that Google Knol is no more.
Fortunately, while it was rather inconvenient that they shut down Google Knol completely, and I'll forever remember a knol as a "unit of abandonment", Google did provide a nice way to download at least your own user content and for that I am grateful.
I have fixed up the internal linkage as much as possible and have placed a copy of the original article below.
Sadly, as I am not "Dark Magus", I am unable to download the Russian translation. If anyone knows how to contact him, I would love to obtain and preserve a copy of the translation as well.