[1] B.W. Henderson, L. Vaughan, D.A. Bellnier, H. van Leengoed, P.G. Johnson, A.R. Oseroff, Photosensitization of murine tumor, vasculature and skin by 5-aminolevulinic acid-induced porphyrin, J. Photochem. Photobiol. B. Biol. 62 (1995) 780.

[2] J.C. Kennedy, R.H. Pottier, Endogenous protoporphyrin IX, a clinically useful photosensitizer for photodynamic therapy, J. Photochem. Photobiol. B. Biol. 14 (1992) 275. J.C. Kennedy, R.H. Pottier, Using d-aminolevulinic acid in cancer therapy, ACS Symp. Ser. 559 (1994) 291.

[3] Kennedy et al proposed first ALA as a possible photodynamic agent. J.C. Kennedy, R.H. Pottier, D.C. Pross, Photodynamic therapy with endogenous protoporphyrin IX: basic principles and present clinical experiences, J. Photochem. Photobiol. B. Biol. 6 (1990) 143.

[4] J. Kloek, G.M.J. Beijersbergen van Henegouwen, Prodrugs of 5-aminolevulinic for photodynamic therapy, Photochem. Photobiol 64 (1996) 994. J.M. Gaullier, K. Berg, Q. Peng, H. Anholt, P.K. Selbo, L.W. Ma, J. Moan, Use of 5-aminolevulinic esters to improve photodynamic therapy on cells in culture, Cancer Res. 57 (1997) 1481.

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