Was Oliveira a Baucherist?

In 1978, or thereabout, Roger Louis Thomas, the then director of the French riding magazine L’information Hippique, asked me to write a bibliographic note on Reflexions sur l’Art Equestre (Reflections on the Equestrian Art), a book by Oliveira (his first book, if memory serves), which was being reprinted. Had it been about any other author, I probably would have proceeded as is customary with this type of task: