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Schraffordt Koops, Heimen, M.H.Edwina Doting, Jakob de Vries, A.Ton M.G Tiebosch, John Th Plukker, Harold J. Hoekstra, and D.Albert Piers. "Sentinel Node Biopsy as a Surgical Staging Method for Solid Cancers." Radiotherapy and Oncology 51, no. 1 (1999): 1-7. https://doi.org/10.1016/S0167-8140(99)00024-9.

Schraffordt Koops, Heimen, et al. "Sentinel Node Biopsy as a Surgical Staging Method for Solid Cancers." Radiotherapy and Oncology, vol. 51, no. 1, 1999, pp. 1-7, https://doi.org/10.1016/S0167-8140(99)00024-9.