Conference paper (2006) - Z. Al-Ars (author), Zaid Al-Ars (author), S Hamdioui (author), Said Hamdioui (author), S. Hamdioui (author), Said Hamdioui (author), AJ van de Goor (author), G. Gaydadjiev (author), Georgi Gaydadjiev (author), J Vollrath (author)