There is the following setting in the .cls file.

usepackage[numbers, %super,
    sort&compress,
    square,
    comma,%
    ]{natbib}
renewcommand{bibnumfmt}[1]{[#1]}
setlength{bibsep}{0.2em}
renewcommand{bibfont}{refsize}

renewcommandrefname{{References}}

It is hoped that these settings will be adhered to as much as possible. (If other macro packages must be used, I hope that the corresponding settings for bibsep, bibfont and bibnumfmt will be given in passing.)

Like the title says.