Bone marrow angio-genesis and mast cell density increase simultaneously with progression of human multiple myeloma - Ribatti, D; Vacca, A; Nico, B; Quondamatteo, F; Ria, R; Minischetti, M; Marzullo, A; Herken, R; Roncali, L; Dammacco, F (Br J Cancer, 1999)