6Barry M Verdegan, Brain W Schwandt, Christophe E Holm. Development of a Traceable Particle Counter Calibration Standard [ C ]. Nagoya, Japan : The Sixth World Filtration Congress, May, 18 - 21,1993.
7ISO 11171 ,Hydraulic Fluid Power-Calibration of Liquid Au- tomatic Particle Counters [ S ].