While it's about a specific incident in Prague, and I'm unsure of whether this is what you're asking about, I participate in a competition called National History Day. Every year there are national winners in each section, and this was the winner for the 2018 competition.
Though made by students, it's extremely well researched and provides a general history in this topic of Prague, 1968.
Sorry if this wasn't what you were looking for, but I hope it helps.