?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=M+V+K&rft.au=Sivakumar%2C+M+V+K&rft.aulast=Sivakumar&rft.atitle=Spatial+Variability+of+Rainfall+at+an+Experimental+Station+in+Niger%2C+West+Africa&rft.title=Theoretical+and+Applied+Climatology&rft.issn=77-798X+&rft.date=1990&rft.volume=42&rft.pages=33-39&rft.issue=1&rft.genre=article