1. CCAC Facts and Figures. 2019. Available from: https://www.ccac.ca/Documents/Publications/CCAC-Facts-and-Figures.pdf
2. European Comission. Seventh report on the statistics on the number of animals used for experimental and other scientific purposes in the member states of the European Union. 2013. Available from: https://eur-lex.europa.eu/legal-content/EN/TXT/PDF/?uri=CELEX:52013DC0859&from=EN
3. Canadian Council on Animal Care. Guidelines on: euthanasia of animals used in science. 2010. Available from: https://www.ccac.ca/Documents/Standards/Guidelines/Euthanasia.pdf
4. American Veterinary Medical Association. Guidelines for the euthanasia of animals. 2013. Available from: https://www.avma.org/sites/default/files/2020-01/2020-Euthanasia-Final-1-17-20.pdf
5. Aversion to gaseous euthanasia agents in rats and mice;MC Leach;Comparative medicine,2002