Working with text is better than markdown. It seems the Grammarly plugin can only process text. Is it true though? 
And, also you need to press from the first paragraph to activate it.

Related to Stereo Camera methods

SLAM
\cite{Usenko_2016,Holzmann_2016}
\cite{Zhu_2017}
CPU
\cite{Spangenberg_2014}
GPU
\cite{Eberli_2010,Hernandez_Juarez_2016}
FPGA
\cite{Schumacher_2014}