Picnometric-additive method for determining the degree of coating of grinding powders superhard matirials with the use of an extrapolation-affine 3D grain model - H. A. Petasiuk; O. O. Bochechka; V. I. Lavrinenko; V. H. Poltoratskyi; V. P. Bilochenko; D. V. Sokoliuk (Superhard Materials, 2020)