found: Work cat.: 91126751: Verhulst, Sabine. La Frottola (XIV-XV sec.) : aspetti della codificazione e proposte esegetiche, 1990.
found: GEV.:v. 2, p. 38 (Frottola. Componimento poetico, popolaresco in origine)
found: Encic. Ital.:v. 16, p. 116ff (Frottola. Componimento poetico ... separate article on Frottola musicale)
found: OED, Suppl.:v. 1, A-G, p. 1168 (Frottola: form of Italian popular song common esp. in the 15th and 16th cent.)
notfound: Web. 3;Dict. lit. thematic terms, 1999;Beckson, K. Lit. Terms, 3d ed. 1989;Williams, M. Patterns of poetry, 1986;Holman, H. Hdbk. to lit., 4th ed. 1980
