1. Radio propagation over a flat Earth across a boundary separating two different media
2. An integral equation approach to the problem of wave propagation over an irregular surface
3. Operational Calculus;Van der Pol,1950
4. Operational Calculus;Van der Pol,1950
5. Atti del Congresso Internazionale della Scoperta Marconiana della Radio;Eckersley,1947