The authors want to thank to the many colleagues that supported and advised them during the writing of the book. Without their support, our enterprise would not have been possible. With the hope that we did not forget any of them, we will mention them here, showing them our gratitude: Petre Roman, Done Serbanescu, Valeriu Sîrbu, Alexandra Comsa, Gabriel Craciunescu, Gheorghe Calotoiu, Cristinel Fântâneanu, Traian Popa, Adina Boroneant, Ionut Semuc.
An inestimable help was of...