?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Makkar%2C+R+S&rft.aulast=Makkar&rft.aufirst=R+S&rft.issue=4&rft.volume=58&rft.date=March+2002&rft.issn=0175-7598&rft.atitle=An+update+on+the+use+of+unconventional+substrates+for+biosurfactant+production+and+their+new+applications.&rft.title=Applied+microbiology+and+biotechnology&rft.pages=428-34&rft.genre=article