[justify] The "things" in my life have worked so well that I can only believe that there has been some divine intervention. So, I thank God for being able to do good things. This book is an example of this.[br] I am grateful to my country that offered me a free public education of quality. This book is a way to repay the high investment that was made in me.[br] I would also like to thank the Research Support Foundation of the Federal District (FAP-DF) and the Federal University of Santa Catarina (UFSC-Blumenau).[/justify][br]