?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Jain%2C+R+K&rft.aulast=Jain&rft.aufirst=R+K&rft.issue=5&rft.volume=53&rft.date=May+1987&rft.issn=0099-2240&rft.atitle=Maintenance+and+stability+of+introduced+genotypes+in+groundwater+aquifer+material.&rft.title=Applied+and+environmental+microbiology&rft.pages=996-1002&rft.genre=article