Spennemann, Dirk HR, and Maggie J Watson. “Dietary Habits of Urban Pigeons (Columba Livia) and Implications of Excreta PH – A Review”.
European Journal of Ecology
, vol. 3, no. 1, June 2017, pp. 27-41,
https://doi.org/10.1515/eje-2017-0004
.