1. Nolan P. J. &Pollak L. W.:The calibration of a photo-electric nucleus counter. Proc. Royal Irish Acad., Dublin; 51 A, 9–31 (1946).
2. Pollak L. W. &Metnieks A. L.:On the determination of the diffusion coefficient of heterogeneous aerosols by the dynamic method. Geofisica pura e applicata, 37; 183–190 (1957).
3. Pollak L. W. &O'Connor T. C.:A photo-electric condensation nucleus counter of high precision. Geofisica pura e applicata, Milano; 32, 139–146 (1955).
4. During the discussion following a lecture in the Dublin Meteorological and Geophysical Seminar on March 19, 1957 in which we described and projected a diagram of the photo-electric nucleus counter for measuring low concentrations of nuclei Dr.R. Fürth, Birkbeck College, London suggested that the multiflex principle should be used in the fog-tube to increase the length of the light path and to open the scale; in a subsequent discussion ProfessorP. J. Nolan proposed using a galvanometer of high sensitivity with suppressed zero and muffed glasses of various opaqueness for checking.
5. Pollak L. W. &Gerlich W.:Lichtelektrische Sichtmessungen I. & II. Gerlands Beitr. z. Geophysik, Leipzig; Bd. 35, 55–65 (1932) & Bd. 37, 271–295 (1932) andPollak L, W.:Objektive Eichung des neuen Goldberg-Stufenkeiles. Ibidem; Gerlands Beitr. z. Geophysik, Leipzig Bd. 39, 240–259 (1933).