1. Die allgemeine chirurgische Pathologie and Therapie;Billroth,1889
2. Soerjomataram I, Coebergh JW. Epidemiology of multiple primary cancers. En: Verma, M., Editor. Methods in Molecular Biology, Cancer Epidemiology, vol. 471. Totowa, New Jersey: Humana Press; 2009. p. 85-105.
3. Howe HL, editor. A review of the definition for multiple primary cancers in the United States. Springfield (IL): North American Association of Central Cancer Registries; 2003.
4. Multiple neoplasms, single primaries, and patient survival;Amer;Cancer Manag Res.,2014
5. Quadruple cancer, including triple cancers in the head and neck region;Németh;Neoplasma.,2002