Zoltewicz, J. A.; Deady, L. W. (1978). "Quaternization of Heteroaromatic Compounds: Quantitative Aspects". Advances in Heterocyclic Chemistry Volume 22. Vol. 22. pp. 71–121. doi:10.1016/S0065-2725(08)60103-8. ISBN9780120206223.
Alajarín, M.; Cabrera, J.; Pastor, A.; Sánchez-Andrada, P.; Bautista, D. (2006). "On the [2+2] Cycloaddition of 2-Aminothiazoles and Dimethyl Acetylenedicarboxylate. Experimental and Computational Evidence of a Thermal Disrotatory Ring Opening of Fused Cyclobutenes". J. Org. Chem.71 (14): 5328–5339. doi:10.1021/jo060664c. PMID16808523.
Alajarín, M.; Cabrera, J.; Pastor, A.; Sánchez-Andrada, P.; Bautista, D. (2006). "On the [2+2] Cycloaddition of 2-Aminothiazoles and Dimethyl Acetylenedicarboxylate. Experimental and Computational Evidence of a Thermal Disrotatory Ring Opening of Fused Cyclobutenes". J. Org. Chem.71 (14): 5328–5339. doi:10.1021/jo060664c. PMID16808523.