• Study of the impact of the treatment period on the surface characteristics of nitinol heat-activated orthodontic wiresPetrov, Valery; Andreeva, Laura; Terzieva, Stanimira; Stoyanova-Ivanova, Angelina; Kovacheva, Daniela; Mikli, Valdek; Ilievska, IvanaInternational journal of science and research (IJSR)2015 / p. 3190-3193 : ill http://www.ijsr.net/archive/v4i4/SUB153329.pdf