Insert reference label

\cite{HSI:Landgrebe}
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According to

Insert multiple labels

\cite{Kraut1999The, kraut2001adaptive, Nasrabadi2008Regularized, Theiler2006Effect, Hybrid2007}.
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According to

According to multiplication sign

5 $\times$ 5
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The results of

$1\times1 m^2$ and $0.5\times0. 5 m^2$
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The results of

Insert the picture

\begin{figure}[htbp]
  \centering
  \includegraphics[width=12cm]{fig/subpixel.pdf}
  \caption{Four examples of targets in the MUUFL Gulfport scene with imprecise labels for illustrating the difficulties of acquiring pixel-level labeled targets. (a) Brown target in size $3\times3 m^2$. (b) Brown target in size $1\times1 m^2$ with one pixel ground truth location drift. (c - d) Faux Vineyard Green targets with potential sub-pixel nature, camouflage color and  tree canopy occlusion.}
  \label{fig:gps_shift_and_subpixel}
\end{figure}
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The results of

Reference picture subscript

Fig. \ref{fig:workflow}
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The results of

Set the font to blue

Start by setting a custom color label

\definecolor{myblue}{RGB}{20.50.200}
\definecolor{mygreen}{RGB}{34.139.34}
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Reference custom color labels

\textcolor{myblue}{The contributions of this work are twofold. First, two sub pixel detectors, Sub-Pixel Adaptive Cosine Estimator (SPACE) and Sub-Pixel Spectral Matched Filter (SPSMF), were developed in this paper for sub-pixel hyperspectral target detection tasks under highly mixed and diverse background.}
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The results of

ie.

 \ie
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The title

\section{Related Work}
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The results of

Greek letters in bold

\usepackage{amsMath} \ boldSymbol {\sigma}

\mathbf only applies the ordinary letter ABC in the formula… Abcdef and so on come into play.

A better way is to use \usepackage{bm} \bm{}

Write the formula

\mathbf{\Sigma}_{b}^{-1} \mathbf{s}}
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The results of

\begin{equation}
  \label{eq:ace}
  R_{\rm ACE}(\mathbf{s}, \mathbf{x})=\frac{\mathbf{s}^{T} \mathbf{\Sigma}_{b}^{-1} \mathbf{x}}{\sqrt{\mathbf{s}^{T} \mathbf{\Sigma}_{b}^{-1} \mathbf{s}} \sqrt{\mathbf{x} ^{T} \mathbf{\Sigma}_{b}^{-1} \mathbf{x} }},
\end{equation}

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The results of

 $\mathbf{\Sigma}_{b}$
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The results of

Formula for reference

From Eq. \eqref{eq:ace} and \eqref{eq:smf} 
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Disallow generation of number \nonumber

\ Nonumber’s “anti”

I’ve probably talked about it before, but anyway. We all know that in multi-line formula environments (such as align) you can use \nonumber (or \notag) to disallow a line to be numbered, like this

Formula a newline

\ \Copy the code

Fill in the blanks

\begin{eqnarray} &=& \left(\frac{\hat{\mathbf{s}}}{\|\hat{\mathbf{s}}\|}\right)^{T}\left(\frac{\hat{\mathbf{x}}}{\|\hat{\mathbf{x}}\|}\right) \nonumber\\ \label{eq:ace_end}
   &=& \hat{\hat{\mathbf{s}}}^{T} \hat{\hat{\mathbf{x}}}, \hfill
\end{eqnarray}
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\cdots
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