1. Environmentally friendly packs;Veys;Optician,1995
2. European Parliament and Council Directive 94/62/EC on packaging and packaging waste, 1994. Accessed at: http://europa.eu.int/smartapi/cgi/sga_doc?smartapi!celexapi!prod!CELEXnumdoc&lg= EN&numdoc=31994L0062&model=guichett from 6 November 2002.
3. Environmental producer responsibility;Evans;Med. Device Technol.,1997
4. Trends in UK contact lens prescribing 2002;Morgan;Optician,2002
5. Does solution cost affect compliance among contact lens wearers?;Sheard;J. Br. Contact Lens Assoc.,1995