1. Spurenlängenkorrektur am Durango Apatit;Bertel;Jahresbericht 1975, Projekt 939 und 1932 des Fonds Förd. Wiss Forschg. Univ. Innsbruck,1976
2. A new method for the measurement of the mean etchable fission track length and of extremely high fission track densities in minerals;Bertel;Nucl. Track Detection,1977
3. Calibrated glass standards for fission track use;Carpenter;NBS Special Publication,1974
4. Spontaneous Emission of Heavy Ions from Uranium;De Carvalho,1975
5. Decay constant for spontaneous fission of 238U and 232Th;Emma;Nucl. Instrum. Methods,1975