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http://scholar.google.com/scholar_lookup?&title=The%20distribution%20of%20C3%20and%20C4%20grasses%20and%20carbon%20isotope%20discrimination%20along%20an%20altitudinal%20and%20moisture%20gradient%20in%20Kenya&journal=Oecologia&volume=37&pages=337-350&publication_year=1979&author=Tieszen%2CLL&author=Senyimba%2CMM&author=Imbamba%2CSK&author=Troughton%2CJH