Here's the Corelli La Follia (Op.5 no.12) for:
Violin and continuo (cello)
Viola and continuo (cello) - in g minor
and here's a Follia by Vivaldi for string trio:
Free sheet music resource for strings: violin, viola, cello, double bass, string quartets, string trios, duets and solo sonatas with continuo, solo unaccompanied works, christmas carols. All free to download/access as pdfs posted on the net.