This author has not been identified. Look up 'Joachim Denil' in GoogleThis author has not been identified. Look up 'Paul De Meulenaere' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Serge Demeyer' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Hans Vangheluwe' in Google