I would like to thank Dorothe Kugler for a lot of support, hints, and helpful criticism, in addition, she wrote the bibliography.
Moreover, thank you very much to the following persons for their important contributions:
Frédéric Abel (CA)	Marco Beghelli (IT)	Massimo Bengoli (IT)
Jan Billington (DE/GR)	Daniel Blanchard (FR)	Thomas Bloch (FR)
Giovanni Christen (CH)	Aris Christofellis (GR)	Bill Daugherty (US)
Roberto Faria jr. (BR)	Pål Finstad (NO)	Leandro da Fonseca (BR)
Nick Fritzsche (US)	Marcin Gajzler (PL)	Luis García (PE)
Peter Giles (UK)	Emiko Hall (JP/CA)	Michael Hardy (UK)
Patrick Husson (FR)	Sergey Khikhich (RU)	Stephan Kopp (DE)
Angelo Manzotti (IT)	Alex Mendez (US)	Cyril Morin (FR)
Gisela & Manfred Mornhinweg (CL)	Elias Pedersen (DK)	Andreas Praefcke (DE)
Matthias Rademacher (DE)	Karola Ringhausen (DE)	Christian Rouillard (CA)
Elsa Scammell + (UK)	Bernard Schreuders (BE)	Joshua A. Slater (US)
Barbara Spuck (DE)	Lauri Robert Storm (FI)	Francisco Tambelli (BR)
Hans van der Velde (NL)	Jörg Waschinski (DE)	Randall K. Wong (US)	_