Schwabe U, Ukena D, Lohse MJ (September 1985). “Xanthine derivatives as antagonists at A1 and A2 adenosine receptors”. Naunyn-Schmiedeberg's Archives of Pharmacology330 (3): 212–21. doi:10.1007/bf00572436. PMID2997628.
Iancu L, Shneur A, Cohen H (1979). “Trials with xanthine derivatives in systemic treatment of psoriasis”. Dermatologica159 (1): 55–61. doi:10.1159/000250562. PMID225216.
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Schwabe U, Ukena D, Lohse MJ (September 1985). “Xanthine derivatives as antagonists at A1 and A2 adenosine receptors”. Naunyn-Schmiedeberg's Archives of Pharmacology330 (3): 212–21. doi:10.1007/bf00572436. PMID2997628.
Iancu L, Shneur A, Cohen H (1979). “Trials with xanthine derivatives in systemic treatment of psoriasis”. Dermatologica159 (1): 55–61. doi:10.1159/000250562. PMID225216.