TY - JOUR A1 - Helsper, Christoph A1 - Fißan, H. J. A1 - Kasper, W. T1 - Calibration of Optical Particle Counters with Respect to Particle Size / Fißan, H. J. ; Helsper, C.; Kasper, W. JF - Particle and Particle Systems Characterization. 1 (1984), H. 1984 Y1 - 1984 SN - 1521-4117 SP - 108 EP - 111 ER -