Não informado. (2000). Technical paper. University of Puerto Rico, Agricultural Experiment Station.
Chicago-referens (17:e uppl.)Não informado. Technical Paper. Rio Piedras, Porto Rico: University of Puerto Rico, Agricultural Experiment Station, 2000.
MLA-referens (8:e uppl.)Não informado. Technical Paper. University of Puerto Rico, Agricultural Experiment Station, 2000.
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