Oops, that's right! Sorry for the misunderstanding.

Best wishes,
Nicolás

On Wed, Jan 3, 2018 at 11:47 AM, Xavier Leroy <Xavier.Leroy@inria.fr> wrote:
On 01/03/2018 11:22 AM, Nicolás Ojeda Bär wrote:
> I am not sure how up-to-date they are, but you may be interested in the following notes by Xavier:
>
>   https://caml.inria.fr/pub/papers/xleroy-recursive_modules-03.pdf

Those notes are about recursive modules, but the original poster was asking for material about first-class modules.  The canonical reference is:

First-class modules and composable signatures in Objective Caml 3.12
    Alain Frisch and Jacques Garrigue. ML Workshop 2010, Baltimore, MD.

Abstract: https://www.math.nagoya-u.ac.jp/~garrigue/papers/ml2010.pdf
Slides: https://www.math.nagoya-u.ac.jp/~garrigue/papers/ml2010-show.pdf

Hope this helps,

- Xavier Leroy

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