Health and Ageing . http://www.nps.org.au/__data/assets/pdf_file/0008/87866/OKA7754_NPS_RADAR_Methoxyflurane_V3.pdf . Retrieved 2010-11-21 .   ^ a b c Nick Baumann (July/August 2011). "Why You're Paying More to Breathe" . Mother Jones . http://motherjones.com/environment/2011/07/cost-increase-asthma-inhalers-expensive .   ^ a b "Asthma Group Concerned "Green" Inhalers May Not be as Effective | ksdk.com | St. Louis, MO" . ksdk.com