A. Armando, S. Ranise: A Practical Extension Mechanism for Decision Procedures: the Case Study of Universal Presburger Arithmetic /jucs_7_2/a_practical_extension_mechanism
I.A. Durand, S.R. Schwer: A Tool for Reasoning about Qualitative Temporal Information: the Theory of S-languages with a Lisp Implementation /jucs_14_20/a_tool_for_reasoning