1. References;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
2. References;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
3. General References;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
4. The Oxo-(Hydroxy-) and Alkoxypurines;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
5. General List of References;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02