Undo/Redo operations in Bitmap-based Collaborative Graphic Editing Systems

@inproceedings{2015UndoRedoOI,
  title={Undo/Redo operations in Bitmap-based Collaborative Graphic Editing Systems},
  author={于方玉 and 付琼琼 and 高丽萍 and 熊乃学 and 张玉本 and 王山山},
  year={2015}
}

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