Acid etching as surface treatment method for luting of glass-ceramic restorations, part 1: Acids, application protocol and etching effectiveness - Bajraktarova Valjakova E, Grozdanov A, Guguvcevski Lj, KorunoskaStevkovska V, Kapusevska B, Gigovski N, Mijoska A, Bajraktarova Misevska C. (Open Access Maced J Med Sci, 2018)