?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Samsul+Maarif%2C+SMF&rft.aufirst=SMF&rft.aulast=Samsul+Maarif&rft.issue=1&rft.volume=13&rft.atitle=Critical+review+on+mathematics+virtual+classroom+practice+in+private+university&rft.date=1+February+2022&rft.issn=2008-6822&rft.title=International+Journal+of+Nonlinear+Analysis+and+Applications&rft.pages=975-982&rft.genre=article