1. Post‐Graduate Program in Oral Science, Division of Restorative Dentistry Federal University of Santa Maria Santa Maria Rio Grande do Sul Brazil
2. Department of Mathematics and Natural Sciences, Blekinge Institute of Technology, Karlskrona, Sweden & Post‐Graduate Program in Electric and Computing Engineering Technological Institute of Aeronautics São José dos Campos Brazil
3. Department of Optics, Faculty of Science University of Granada Granada Spain