Blum, Alexander S. Historical Epistemology of the Final Theory Program, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;
Blum, A. S. (2018). Without New Difficulties: Quantum Gravity and the Crisis of the Quantum Field Theory Program. In A. S. Blum, & D. Rickles (Eds.), Quantum Gravity in the First Half of the Twentieth Century: A Sourcebook (pp. 255-269). Berlin: Edition Open Access.