R. G. Lund, E. Piva, F. R. R. de Moura, F. F. Demarco, J. de O. Lima, and P. E. C. Cardoso, “Two-year clinical wear performance of two polyacid-modified resin composites (compomers) in posterior permanent teeth”, Braz. J. Oral Sci., vol. 7, no. 25, pp. 1539–1542, Jan. 2016.