1. Gogolewski S, Pennings AJ (1984) Advances in Biomaterials 5:313
2. Lei van der B, Lommen E, Wildevuur CRH, Leenslag JW, Gogolewski S, Pennings AJ, Bartels HL, Nieuwenhuis P, Hulstaert CE, Blaauw EH, Dijk F, Molenaar I (1986) Proc of Polymers in Medicine and Surgery 5:19/1
3. Lei van den B (1986) PhD Thesis, Groningen
4. Leenslag JW (1987) PhD Thesis, Groningen
5. Lelah MD, Cooper SL (1986) Polyurethanes in Medicine. CRC press Inc, Boca Raton, Florida