?url_ver=Z39.88-2004&rft_id=10.11591%2Fijaas.v14.i4.pp1393-1401&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Johal%2C+Muhammad+Syahrani&rft.aufirst=Muhammad+Syahrani&rft.aulast=Johal&rft.title=International+Journal+of+Advances+in+Applied+Sciences&rft.issue=4&rft.volume=14&rft.atitle=Methods+used+to+enhance+the+physicochemical+properties+of+natural+ester+insulating+oils+for+transformers%3A+a+review&rft.date=2025&rft.pages=1393+%E2%80%93+1401&rft.issn=22528814&rft.genre=article