Further research on the projective covering method. Reply to comments by A. Carpinteri, B. Chiaia and S. Invernizzi on the paper "Direct fractal measurement of fracture surfaces", Int. J-solids and structures 36, 3073-3084, by H. Xie and J. Wang
H. Xie et al., Further research on the projective covering method. Reply to comments by A. Carpinteri, B. Chiaia and S. Invernizzi on the paper "Direct fractal measurement of fracture surfaces", Int. J-solids and structures 36, 3073-3084, by H. Xie and J. Wang, INT J SOL S, 37(33), 2000, pp. 4627-4630