@inbook {502,
	title = {Helsinki},
	booktitle = { Kelcey, John G. (Ed.), Vertebrates and Invertebrates of European Cities: Selected Non-Avian Fauna. },
	year = {2015},
	pages = {323{\textendash}378},
	keywords = {Aculeata},
	url = {http://www.springer.com/us/book/9781493916979},
	author = {Venn, S. and Schulman, H. and T{\"o}rr{\"o}nen, S. and Salla, A. and Pajunen, T. and Kerppola, S. and Paukkunen, J. and Nieminen, M. and Vilisics, F. and Karjalainen, S.}
}
