@article {1216,
	title = {Are spring mass migrations of bumblebees and wasps driven by vole cyclicity?},
	journal = {Oikos},
	volume = {91},
	year = {2000},
	pages = {401-404},
	author = {Veps{\"a}l{\"a}inen, K. and Savolainen, R.}
}
@article {1212,
	title = {Successional changes of ant assemblages : from virgin and ditched bogs to forests},
	journal = {Annales Zoologici Fennici},
	volume = {37},
	year = {2000},
	pages = {135-149},
	author = {Veps{\"a}l{\"a}inen, K. and Savolainen, R. and Tiainen, J. and Vil{\'e}n, J.}
}
