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2. Partial characterization of the proteic fractions extracted from tobaco leaves;Ares;Cubatabaco,1999
3. An Introduction to Fuzzy Control;Driankov,1993
4. Instituto de Investigaciones del Tabaco, Ministerio de la Agricultura de Cuba: Instructivo Técnico para el cultivo del Tabaco Negro Curado, 2001.
5. Kalfrisa, User Manuel, 1988, (in Spanish).