1. Zaba C, Marcinkowski JT, Wojtyla A, Tezyk A, Tobolski J, Zaba Z. Acute collective gas poisoning at work in a manure storage tank. Ann Agric Environ Med. 2011;18(2):448–51.
2. Romeo L, Prigioni P, Marcheselli S, Marchiori L, Cerpelloni M, Fiorini C, et al. Acute poisoning with carbon dioxide: report of 2 fatal cases. Med Lav. 2002;93:26–33.
3. Zugibe FT, Costello JT, Breithaupt MK, Zappi E, Allyn B. The confined space-hypoxia syndrome. J Forensic Sci. 1987;32:554–60.
4. National Traumatic Occupational Fatality database 1980-1989. The National Institute for Occupational Safety and Health. West Virginia: US Department of Health and Human Services; 1992.
5. New OSHA rescue requirements for confined space retrieval. Occupational Safety and Health Administration, USA. 2015.