1. EPA (2013) Systematic evaluation of aggressive air sampling for Bacillus anthracis spores: Assessment and evaluation report. Research Triangle Park, NC: U.S. Environmental Protection Agency. EPA 600/R-13/068 EPA 600/R-13/068.
2. Evaluation of surface sampling for Bacillus spores using commercially available cleaning robots;SD Lee;Environmental Science & Technology,2013
3. Patil GP, Gore SD, Taillie C (2010) Composite sampling: a novel method to accomplish observational economy in environmental studies: Springer.
4. Cost analysis of composite sampling for classification;GD Johnson;Environmental and Ecological Statistics,2001
5. Environmental sampling for spores of Bacillus anthracis;EH Teshale;Emerging Infectious Diseases,2002