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That's an excellent solution. I will use it, but I have a problem: the margin note using \mynote{This is a margin note example} uses a line and half spaces. How can I do margin notes with single line spacing? Regards.

I will re-do the Tufte template with footnotes and sidenotes from other template, of course!
I've just tested the Memoir Template and I works.
Thanks a lot.

Thanks a lot.
Can I use the Article template?
Regards.

Yes, that is the problem.
Can you suggest me a template with marginnotes AND footnotes?
Regards.

I'm using the Tutte Template with Lyx.

\documentclass[a4paper,14pt,twoside]{tufte-book}
\begin{document}
First paragraph \sidenote{This is the first paragraph, numbered 1}
Second paragraph \footnote{The second paragraph is numbered a. This is a long note, and I want to do a footer note. shsdjgshd ...

I'm using the Tufte Template.
The template replace all footnotes to sidenotes.
I need sidenotes to make small notes (for example, references a book). The sidenotes are numbered 1, 2, 3...
But in some cases I have a big note, and I want to put it in a footnote, for spaces reasons. The footnotes are ...

I've tried it; but the values are grayed and can not be modified.
The Tufte Template is a special template. Should I modify a file directly?
Thanks in advance.

I'm a begginer lyx user. I'm using the Tufte Book Template, and I need to personalize the paper size and the right margin (notefooters).
I'm using LyX in a Ubuntu installation. Thanks in advance.