Ricchi P, Pignata S, Di Popolo A, Memoli A, Apicella A, Zarrilli R, Acquaviva AM. Effect of aspirin on cell proliferation and differentiation of colon adenocarcinoma Caco-2 cells. Int J Cancer. 1997 Dec 10;73(6):880–4. doi: 10.1002/(sici)1097-0215(19971210)73:6<880::aid-ijc20>3.0.co;2-7. PMID: 9399670.