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Heart (British Cardiac Society)|December 1, 1996
Welder identity, weld date, and the risk of outlet strut fracture in Björk-Shiley convexo-concave valves: the Dutch cohort studyM Kallewaard, A Algra, Y van der GraafNederlands Tijdschrift Voor Geneeskunde|October 9, 1998
[Chronicle of a defective heart valve prosthesis]Y van der Graaf, M Kallewaard, A AlgraNederlands Tijdschrift Voor Geneeskunde|December 12, 2002
[Postmenopausal hormone-replacement therapy discredited, except in healthy women shortly after menopause]A H E M Maas, Y van der GraafThe Journal of Thoracic and Cardiovascular Surgery|April 16, 1998
Prophylactic replacement of Björk-Shiley convexo-concave valves at risk of strut fracture. Björk-Shiley Study GroupM Kallewaard, A Algra, J Defauw, et al.International Journal of Epidemiology|June 1, 1988
Cervical cancer mortality in the NetherlandsY van der Graaf, G A Zielhuis, G P VooijsActa Cytologica|July 1, 1987
The presence of endometrial cells in cervical smears in relation to the day of the menstrual cycle and the method of contraceptionG P Vooijs, Y van der Graaf, M A VooijsThe Journal of Thoracic and Cardiovascular Surgery|March 30, 1999
Which manufacturing characteristics are predictors of outlet strut fracture in large sixty-degree Björk-Shiley convexo-concave mitral valves? The Björk-Shiley Study GroupM Kallewaard, A Algra, J Defauw, et al.Gynecologic Oncology|July 1, 1988
Population screening for cervical cancer in the region of Nijmegen, The Netherlands 1976-1985Y van der Graaf, P G Vooijs, G A ZielhuisActa Cytologica|July 1, 1987
Cellular composition of cervical smears in relation to the day of the menstrual cycle and the method of contraceptionG P Vooijs, Y van der Graaf, A G EliasPageof 42