?url_ver=Z39.88-2004&rft_id=doi%3A10.1051%2Fshsconf%2F20184902005&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Diponegoro%2C+Ahmad&rft.aulast=Diponegoro&rft.aufirst=Ahmad&rft.title=Enhancement+method+for+assignments+of+staff+in+multiple+events&rft.date=October+2018&rft.issn=2261-2424&rft.genre=proceeding