Some experience of reference in Latex __latex

This is often the case when writing references in Latex, and the packages that need to be introduced are different for publishers, such as IEEE and Elaver. Search solution, found a useful blog, reprinted, convenient next time to use ~ ~

1, how to use the \cite command at the same place paper multiple documents.
Use\cite{BIBTEX1}\cite{BIBTEX2}\cite{BIBTEX3}, then the body reference at the time of compilation shows [1][2][3];
and I use\cite{BIBTEX1,BIBTEX2,BIBTEX3}, then the body reference at the time of compilation shows [1,2,3];
How to display [1-3] when the source of the reference is shown in the text.
\usepackage[numbers,sort&compress]{natbib}% but this will make the reference font larger.
So I used \usepackage{cite}%\cite{bibtex1,bibtex2,bibtex3}--> [1]-[3]2, how to make continuous reference can be used in the middle of the dash to connect. Like [6,7,8,9] into [6-9]?Method: Add the following statement command before the document starts
\usepackage[numbers,sort&compress]{natbib}
Not only can compress the reference document marking, but also can carry on the sorting, namely regardless of the text inside the order how, displays all is the order. In the Elsevier template, the Natbib package has been referenced by default, no need to refer back, change the Natbib option, set the method as follows:\biboptions{numbers,sort&compress}The following is the way to find, feel also very good, just for reference.3, how to implement the reference document marking in the upper right corner.
Method: Add the following statement command before the document starts
\newcommand{\upcite}[1]{\textsuperscript{\textsuperscript{\cite{#1}}}}
Then use the format of \upcite{} when referencing (normal reference format is\cite{}）

4, there is no more good-looking than the equal number, less than equal number. (The default sign is parallel, without inclination)
Methods: \geqslant and \leqslant instead of \geq and \leq

Reference:
(1) How to add references in latex
(2) Reference reference in Latex: Introduction to the use method of BibTeX
(3) https://www.cnblogs.com/genkun/p/6738192.html
(4) http://laser2007.blog.sohu.com/165757649.html
(5) http://blog.sina.com.cn/s/blog_48527c9c0100q48t.html
(6) http://blog.sina.com.cn/s/blog_97db34e801016wsp.html

(7) Primary use method of latex