A note on the Sigma1 spectrum of a theory. - Michael Möllerfeld; Michael Rathjen (Arch. Math. Log., 2002)

Generalized inductive definitions - Michael Möllerfeld (2003)

Comparing Inductive and Circular Definitions: Parameters, Complexity and Games. - Kai-Uwe Kühnberger; Benedikt Löwe; Michael Möllerfeld; Philip D. Welch (Stud Logica, 2005)

The determinacy strength of Pi12-comprehension. - Christoph Heinatsch; Michael Möllerfeld (Ann. Pure Appl. Log., 2010)