References
Philip Welch
with Horsten Leon (2009). The undecidability of propositional adaptive logic. Synthese, 169 (1), 217-218. https://doi.org/10.1007/s11229-009-9496-x.
with Horsten Leon (2007). The undecidability of propositional adaptive logic. Synthese, 158 (1), 41-60. https://doi.org/10.1007/s11229-006-9049-5.