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4. O. A. Myazdrikov, ?Device for the bulk particle size analysis of free-flow ing materials,? Inventor's Certificate No. 180850, Byull. Izobret., No. 8 (1966).
5. V. N. Lazutin and O. A. Myazdrikov, ?Method for determining the particle size distributions of finely dispersed powder materials,? Zavod. Lab.,44, No. 9, 1104?1107 (1978).