International journal of environmental research and public health, vol 13, iss 11 International Journal of Environmental Research and Public Health, Vol 13, Iss 11, p 1054 (2016) Baldauf, Richard W; Devlin, Robert B; Gehr, Peter; Giannelli, Robert; Hassett-Sipple, Beth; Jung, Heejung; Martini, Giorgio; McDonald, Joseph; Sacks, Jason D; Walker, Katherine (2016). Ultrafine Particle Metrics and Research Considerations: Review of the 2015 UFP Workshop. International journal of environmental research and public health, 13(11) Molecular Diversity Preservation International MDPI 10.3390/ijerph13111054 International Journal of Environmental Research and Public Health