Martins, G. C., Meier, M. M., Loguercio, A. D., Cecchin, F., Gomes, O. M. M. and Reis, A. (2015) “Effects of zirconia nanoparticles addition to experimental adhesives on radiopacity and microhardness”, Brazilian Journal of Oral Sciences. Limeira, SP, 12(4), pp. 319–322. doi: 10.20396/bjos.v12i4.8640945.