Ronneau, C., Detry, M., Hallet, JP., & Lardinois, P. (1983). Concentration of Some Elements in the Hair of Cattle As An Indicator of Contamination By Air Pollutant Deposition On Grass. Agriculture, Ecosystems & Environment, 10(3), 285-298. https://doi.org/10.1016/0167-8809(83)90047-6 (Original work published 1983)