M Merlos, L Gomez, ML Vericat, J Bartroli, J Garcia-Rafanell and J Forn. Structure-activity relationships in a series of xanthine derivatives with antibronchoconstrictory and bronchodilatory activities. European Journal of Medicinal Chemistry, Volume 25, Issue 8, October 1990, Pages 653-658.
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http://dx.doi.org/10.1016/0223-5234(90)90130-U