1. References;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
2. General References;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
3. Syntheses from Pyrimidines;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
4. General List of References;Chemistry of Heterocyclic Compounds: A Series Of Monographs;2008-01-02
5. Synthesis of N-substituted xanthines (review);Chemistry of Heterocyclic Compounds;1991-01