1. ACRP (2013) Apron planning administration and design guidebook. Transportation Research Board, 96.
http://www.trb.org
2. Agarwal R (2009) Sustainable (green) aviation: challenges and opportunities. SAE Int J Aerosp 2(1):1–20.
https://doi.org/10.4271/2009-01-3085
3. Al-Aomar R (2010) A combined ahp-entropy method for deriving subjective and objective criteria weights. Int J Ind Eng: Theory Appl Pract 17(1):12–24
4. Arushi, Drews S (2011) Aviation and environment. Working paper (Online). Centre for science and environment. Available at:
http://cseindia.org/userfiles
/aviation_paper.pdf (Accessed 15 Feb 2018)
5. ATAG (2011). Beginner’s guide to aviation biofuels. (online) Air transport action group. Retrieved from:
http://www.safug.org/assets/docs/beginners-guide-to-aviation-biofuels.pdf
(Accessed 15 Feb 2018)