1. The clonal evolution of tumor cell populations;Nowell;Science,1976
2. Ueber entzundung und eiterung;Cohnheim;Path Anat Physiol Klin Med,1867
3. Nesso fisio-pathologico tra la struttura dei nei materni e la genesi di alcuni tumori maligni;Durante;Arch Memor Observ Chir Pract,1874
4. Stem cells, cancer, and cancer stem cells;Reya;Nature,2001
5. Cancer initiation and progression: involvement of stem cells and the microenvironment;Tysnes;Biochim Biophys Acta,2007