Latex multiple cross-ref within one bracket with sorting and compressing

 See the cleveref package.

\usepackage{cleveref}
\newcounter{saveenum}
 \newcounter{savetmp}
 \Crefformat{saveenum}{#2#1#3}
 \crefformat{saveenum}{#2#1#3}
 \crefrangeformat{saveenum}{#3#1#4-#5#2#6}
 \Crefrangeformat{saveenum}{#3#1#4-#5#2#6}
 \crefmultiformat{saveenum}{#2#1#3}{, #2#1#3}{, #2#1#3}{, #2#1#3}
 \Crefmultiformat{saveenum}{#2#1#3}{, #2#1#3}{, #2#1#3}{, #2#1#3}
 \crefrangemultiformat{saveenum}{#3#1#4-#5#2#6}{#3#1#4-#5#2#6}{, #3#1#4-#5#2#6}{, #3#1#4-#5#2#6}
\Crefrangemultiformat{saveenum}{#3#1#4-#5#2#6}{#3#1#4-#5#2#6}{, #3#1#4-#5#2#6}{, #3#1#4-#5#2#6}