You will find in this section articles dealing with Sulcorebutias, Weingartias and Cintia. They are like the "history" of a section of the cactology of the 5 or 6 last decades. We'll start with an article by Martin Cardenas published in 1951. But there are also quite recent articles.
All were originally published in various journals published by cactophilic associations . Of course, I made contact with these associations for publishing permissions.
I would like to stress here the kindness of these people. Without exception, all agreed immediately without any condition. I would even say that they were excited by my idea and they encouraged me.