1. Über den Vertikalaustausch;Frankenberger;Phys. Atmos.,1960
2. Horbert , M. Untersuchungen zur atmospharischen Turbulenz mittels Radon 220 als Tracer Aachen, Germany 1969
3. Israël , H. M. Horbert C. de La Riva The thoron content of the atmospher and its relation to the exchange conditions 1967
4. Israël , H. M. Horbert C. de La Riva Measurements of the thoron concentration of the lower atmosphere in relation to the exchange ('Austausch') in this region 1968
5. Israël , H. M. Horbert C. de La Riva Measurements of the thoron concentration of the lower atmosphere in relation to the exchange in this region 1969