@Article{FH+23, Author = "Fandinno, J. and Hansen, Z. and Lierler, Y. and Lifschitz, V. and Temple, N.", Year = "2023", Title = "{External Behavior of a Logic Program and Verification of Refactoring}", Journal = "Theory and Practice of Logic Programming", Volume = "23", Number = "4", Pages = "933-947", Comment = "TPTPRef" }