doi:10.1002/jpln.19931560317HöfnerWILEY‐VCH VerlagZtschrift Für Pflanzenernhrung Und Bodenkunde
Frankfurt Airport adopts new security concepts%Critical PartsSecurity concerns in air transport - and therefore at Frankfurt Airport - have always been a top priority. Before 11 September 2001, all persons wishing to enter areas of top security at Frankfurt airport needed a special entry permit (...