Adolf Lindenbaum: Notes on his Life, with Bibliography and Selected References. - Jan Zygmunt; Robert Purdy (Logica Universalis, 2014)

A Physically-Motivated Quantisation of the Electromagnetic Field on Curved Spacetimes. - Ben Maybee; Daniel Hodgson; Almut Beige; Robert Purdy (Entropy, 2019)

Comparing Hermitian and Non-Hermitian Quantum Electrodynamics. - Jake Southall; Daniel Hodgson; Robert Purdy; Almut Beige (Symmetry, 2022)