Hassner, Alfred, ed. (January 2008). Small Ring Heterocycles. Chemistry of Heterocyclic Compounds: A Series of Monographs. Vol. 42. Wiley, Chemistry of Heterocyclic Compounds: A Series Of Monographs. doi:10.1002/9780470187203. hdl:2027/mdp.39015078685115. ISBN9780471056249.
Hassner, Alfred, ed. (January 2008). Small Ring Heterocycles. Chemistry of Heterocyclic Compounds: A Series of Monographs. Vol. 42. Wiley, Chemistry of Heterocyclic Compounds: A Series Of Monographs. doi:10.1002/9780470187203. hdl:2027/mdp.39015078685115. ISBN9780471056249.