Use of experimental design for the optimization of the production of new secondary metabolites by two penicillium species - Pimenta, Eli Fernando; Vita-Marques, Aline Maria; Tininis, Aristeu; Seleghim, Mirna Helena Regali; Sette, Lara Durães; Veloso, Katyuscya; Ferreira, Antonio G; Williams, David E; Patrick, Brian o; Dalisay, Doralyn S; Andersen, Raymond J; Berlinck, Roberto Gomes de Souza (Journal of Natural Products, 2010)