TeX and LaTeX is open source software you can download for free that allows you to create files for suitable for printing and PDF, incorporating mathematical symbols, equations and formulas, which can be difficult to do with standard word processors such as Microsoft Word.
Overleaf is a website similar to GoogleDocs for creating LaTeX documents in the cloud, without having to download and install software. Accounts are free, but you can pay for extra features such as group collaboration.
Below on the left is a Latex markup document, with the formatted result on the right.
(click for larger view)
(image example source: Wikimedia Commons)
BibTeX is an application of LateX that makes the job of creating footnotes, bibliographies, and reference lists more straightforward. You can build a database of citations for all the articles, websites, books, etc. that you are using for your research project, for easy formatting and inserting in a LaTeX document and more easily format citations with multlingual characters, formulas and equations. BibTex has a built-in style for AMS (American Mathematical Society) citations.
Use the BibTeX button in Scholar OneSearch or MathSciNet to get a bibTex-formatted citation. For example:
Lee, Kyungyong, Li Li, and Andrei Zelevinsky, Positivity and Tameness in Rank 2 Cluster Algebras, Journal of Algebraic Combinatorics 40 (2014), no. 3, 823-40, DOI: 10.1007/s10801-014-0509-6.
Will look like this in BibTex:
@article{myArticle1,
author = {Lee, Kyungyong and Li, Li and Zelevinsky, Andrei},
journal = {Journal of Algebraic Combinatorics},
pages = {823--840},
volume = {40},
number = {3},
year = {2014},
title = {Positivity and tameness in rank 2 cluster algebras},
DOI = {10.1016/j.aim.2016.03.022},
}
In Scholar OneSearch, click the "Export BibTex" button.
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In MathScinet, click Export BibTex dropdown
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In addition to the documentation at http://www.latex-project.org, you can also find the following documentation: