I believe than you can find some Conti's material online ! But in french ...
Conti was playing with ivory balls, important to remember when you read Conti's writings.
Marty is a symbol of a modern billard era , like Ceulemans.
I met Jean Marty many years ago , I even took lessons from him. The man had some 'genius' genoma , aka was sometimes a bit hard to follow/understand ... i feel that , probably because i wasn't good enough to understand all his theory ! a very unusual man he was.