This author has not been identified. Look up 'Keryan Didier' in GoogleThis author has not been identified. Look up 'Dumitru Potop-Butucaru' in GoogleThis author has not been identified. Look up 'Guillaume Iooss' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Albert Cohen' in GoogleThis author has not been identified. Look up 'Jean Souyris' in GoogleThis author has not been identified. Look up 'Philippe Baufreton' in GoogleThis author has not been identified. Look up 'Amaury Graillat' in Google