This author has not been identified. Look up 'Husen M. Umer' in GoogleThis author has not been identified. Look up 'Enrique Audain' in GoogleThis author has not been identified. Look up 'Yafeng Zhu' in GoogleThis author has not been identified. Look up 'Julianus Pfeuffer' in GoogleThis author has not been identified. Look up 'Timo Sachsenberg' in GoogleThis author has not been identified. Look up 'Janne Lehtiö' in GoogleThis author has not been identified. Look up 'Rui Mamede Branca' in GoogleThis author has not been identified. Look up 'Yasset Pérez-Riverol' in Google