We are very thankful to all the people who helped us with the writing of this paper, and especially to both our instructors Prof.Dr.Claus C. Hilgetag and Prof.Dr.Paul Crowther.We very much appreciate their help and their guidance in choosing a topic of very much interest and dealing with it from an interesting point of view. Thank you again for all your help!
And we would like to additionally thank Prof.Dr.Claus C. Hilgetag for his consenting to us using his pictures.
