Uwe Egly On Different Intuitionistic Calculi and Embeddings from Int to S4. [Citation Graph (0, 0)][DBLP] Studia Logica, 2001, v:69, n:2, pp:249-277 [Journal]
Raymond D. Gumb An Extended Joint Consistency Theorem for a Nonconstructive Logic of Partial Terms with Definite Descriptions. [Citation Graph (0, 0)][DBLP] Studia Logica, 2001, v:69, n:2, pp:279-292 [Journal]