Pileri S, Ascani S, Sabattini E, Fraternali-Orcioni G, Poggi S, Piccioli M, Piccaluga P, Gamberi B, Zinzani P, Leoncini L, Falini B. The pathologist’s view point. Part I--indolent lymphomas. Haematologica 2000; 85(12):1291-1307.