?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Roy+Stefanus+Yapanto&rft.aulast=71150122&rft.au=71150122%2C+Roy+Stefanus+Yapanto&rft.date=November+2021&rft.inst=Universitas+Kristen+Duta+Wacana&rft.degree=Final+Year+Projects+(S1)&rft.title=SISTEM+PAKAR+ANALISIS+TINGKAT+RESIKO+TERPAPAR+COVID-19+DENGAN+METODE+CERTAINTY+FACTOR