I want to thank my friend James Pickering, for his constant help, advice and incentive, not only in the construction of this site, but in many other things. James is a formidable, generous and kind man. His enthusiasm is contagious! I am lucky for having his friendship - he became my mentor in my journey to knowledge. Thank you, James!
I am grateful to my friend Kazuya Yamane, for his patience and skill in drawing the wonderful picture that is now the logo of my site.
I am thankful to many other friends and collaborators
who have provided me with invaluable data, suggestions, comments and opinions
so that this site could be brought in to being. Especially, I want to thank
Marcelo Fontana, Tony Mace, Pierre Braun, Francisco Campos and Charles