A Systematic Literature Review of Agentic AI: Definitions, Architectures, and Challenges. - Cassiano Moralles; Luis Antonio Leite Francisco da Costa; Sandro José Rigo; Rafael Kunst; Vinicius Costa de Souza; Éderson Passos Silva; George Lucas Ebertz Prado; Taimisson De Carvalho Schardosim; Alex Roehrs (IEEE Access, 2026)