1. Advanced Composite Manufacturing Centre. (visited 03.06.15.).
2. Aluminium Honeycombs, Alcore Inc. – A Gill Company, http://www.thegillcorp.com (visit on 28.04.28.).
3. Aviation Maintenance Technician Handbook—Airframe,2012
4. Balsa Wood Core, Airex AG Industrie, http://www.3accorematerials.com (visit on 28.04.15.).
5. Sandwich core materials & technologies – Part I;Beckwith;SAMPE Journal,2008