6[4]Thibert R, Akbarieh M, Tawashi R. Application of fractal dimension to the study of the surface ruggedness of granular solids and exipients[J]. J Pharm Sci, 1988, 77:724-726.
7[5]Carstensen JT, Franchini M. The use of fractal geometry in pharmaceutical systems [J]. Drug Dev Ind Pharm, 1993, 19 : 85-100.
8[6]Kaye BH, Clark GG, Leblanc JE, et al. Image analysis procedures for characterizing the fractal dimension of fine particles[J]. Part Charact, 1987, 4(2) :63-66.
9[7]Brittain HG, Sachs CT, Fiorelli K. Physical characterization of pharmaceutical excipients: practical examples[J]. Pharm Tech, 1991, 8:38-52.
10[8]Usteri M, Bonny JD, Leuenberger H. Fractal dimension of porous solid dosage forms [J]. Pharm Acta Heiv, 1990, 65 (2) : 55-61.