Loch, V. do C.; Marques, G. E. de C.; Rocha, A. E.; Nascimento, D. S. B.; Costa, M. C. C. de A. Study of Plant Genetic Resources for Medicinal Purposes in Transition Areas in the State of Maranhão, Brazil. Rev. Biol. Neotrop. 2018, 14, 45-55.