* Lacki, Jan, Ruegg, H., and Valentine Telegdi (1999) "The Road to Stueckelberg's Covariant Perturbation Theory as Illustrated by Successive Treatments of Compton Scattering.
* Lacki, Jan, Ruegg, H., and Valentine Telegdi (1999) «The Road to Stueckelberg’s Covariant Perturbation Theory as Illustrated by Successive Treatments of Compton Scattering.» "Studies in History and Philosophy of Modern Physics".