. "Fredholm, BB"^^ . "Klotz, KN"^^ . "IJzerman, AP"^^ . "Linden, J"^^ . "Jacobson, KA"^^ . "PubMed"^^ . "11734617"^^ . "Pharmacol Rev 53:527-52"^^ . "International Union of Pharmacology. XXV. Nomenclature and classification of adenosine receptors"^^ . "2001"^^ .