Dear Friends, Tichy A, Bradna P. Applicability of Exposure Reciprocity Law for Fast Polymerization of Restorative Composites Containing Various Photoinitiating Systems. Oper Dent. 2021 Jul 1;46(4):406-418. doi: 10.2341/20-112-L. PMID: 34478559. Carlos Alberto Castañeda T. | Bibliotecólogo Asistente Universidad CES | Calle 10A # 22-04 | Medellín, Colombia Tel: (57) (4) 444 0555 Ext. 1132 | Fax: (57) (4) 266 6046 [log in to unmask]<mailto:[log in to unmask]> | www.ces.edu.co<http://www.ces.edu.co/>