1. Aldol condensations over reconstructed Mg–Al hydrotalcites: structure–activity relationships related to the rehydration method;Abello;Chem. Eur. J.,2005
2. Buchel, K.H., 1975. Process for the Production of N-tritylimidazoles. US Patent. 3,929,820.
3. Braude, V., Aronhime, J., Shabat, S., 2005. Methods for the Production of Sildenafil Base and Citrate Salt. US Patent. 2005 0,182,066.
4. Hydrotalcite-type anionic clays: Preparation, properties and applications;Cavani;Catal. Today,1991
5. Chavhan, B., Rathinapandian, J., Chanduptla, S.K., Ghanda, N., 2014. An Improved Process for the Preparation of Linagliptin. WO Patent. 2014 097314.