1. Carstens (2010)
2. Cavanagh (1997)
3. Enjuanes L, Siddell SG, Spaan WJ (1998) Coronaviruses and arteriviruses. Plenum, New York
4. Enjuanes L, Brian D, Cavanagh D, Holmes K, Lai MMC, Laude H, Masters P et al (1999a) Coronaviridae. In: Murphy FA et al (eds) Virus taxonomy. Academic, New York
5. Enjuanes L, Spaan SE, Cavanagh D (1999b) Nidovirales. In: Murphy FA et al (eds) Virus taxonomy. Academic, New York