The same place in the Latex references multiple articles __latex

Reproduced from [http://blog.sina.com.cn/s/blog_97db34e801016wsp.html]

1, how to use the \cite command at the same place paper multiple documents.

With \cite{bibtex1}\cite{bibtex2}\cite{bibtex3}, the text referenced at the beginning of the compilation shows [1][2][3];
With \cite{bibtex1,bibtex2,bibtex3}, the text referenced at the beginning of the 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.

With \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. For example [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 marking in the upper-right corner.
Method: Add the following statement command before the document starts
\newcommand{\upcite}[1]{\textsuperscript{\textsuperscript{\cite{#1}}}
and then refer to using \ The format of upcite{} (general normal reference format is \cite{})

4, there is no more attractive than equals number, less than equal number. (in the default symbol, the equals sign is parallel, without inclination)
Method: \geqslant and \leqslant replace \geq and \leq