The list of authors and indications is of course incomplete.
New suggestions are welcome.
La culture en question. The page of a course on Roland Barthes. The page includes also various other Eco indications. An explaination of Greimas themes in the rich site of Semiotics edited by Robert Marty, University of Perpignan, France. Hjemslev's page in the rich site of Semiotics edited by Robert Marty, University of Perpignan, France.