authors added; a, b, c complited
Revert "authors added; a, b, c complited"

This reverts commit 23d9e87adbb2535998bcd01ab97a32bc92f43acb.
Revert "Revert "authors added; a, b, c complited""

This reverts commit c58c96de1ba228a742a0cd011f4385fbb3819892.