Derivation and quantitative analysis of the differential self-interrogation Feynman-alpha method J. Anderson, L. Pál, I. Pázsit, D. Chernikova and S. Pozzi Eur. Phys. J. Plus, 127 2 (2012) 21 Published online: 16 February 2012 DOI: 10.1140/epjp/i2012-12021-3