COLiER: Collaborative Editing of Raster Images. - Ulrike Bath; Sumit Shekhar 001; Jürgen Döllner; Matthias Trapp 001 (CW, 2021)

CERVI: collaborative editing of raster and vector images. - Ulrike Bath; Sumit Shekhar 001; Julian Egbert; Julian Schmidt; Amir Semmo; Jürgen Döllner; Matthias Trapp 001 (Vis. Comput., 2022)