Higes M., Meana A., Bartolomé C., Botías C., Martín-Hernánde R. (2013) Nosema ceranae (Microsporidia), a controversial 21st century honey bee pathogenEnvironmental Microbiology Reports 5(1): 17–29. http://onlinelibrary.wiley.com/doi/10.1111/1758-2229.12024/abstract