?url_ver=Z39.88-2004&rft_id=10.1109%2FAIVR50618.2020.00060&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.aufirst=N.F.S.&rft.au=Jeffri%2C+N.F.S.&rft.aulast=Jeffri&rft.title=Problems+with+Physical+Simulation+in+a+Virtual+Lego-based+Assembly+Task+using+Unity3D+Engine&rft.date=2020&rft.isbn=9781728174631&rft.genre=proceeding