On the invariance of Gödel's second Theorem with regard to Numberings. - Balthasar Grabmayr (Rev. Symb. Log., 2021)

Self-Reference Upfront: a Study of Self-Referential Gödel Numberings. - Balthasar Grabmayr; Albert Visser (Rev. Symb. Log., 2023)

Varieties of Self-Reference in Metamathematics. - Balthasar Grabmayr; Volker Halbach; Lingyuan Ye (J. Philos. Log., 2023)

A Step Towards Absolute Versions of Metamathematical Results. - Balthasar Grabmayr (J. Philos. Log., 2024)