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Anthemis arvensis
it's not genus Leucanthemum, leaves are not simple, it is genus Anthemis, A. arvensis. take a look: http://eol.org/pages/468395/overview
Leucanthemum is also daisy family. It is oxeye daisy?
http://en.wikipedia.org/wiki/Leucanthemu...
Monika, I agree with u, also think this is Leucanthemum sp. (have to see leaves for right sp. :)), B. perennis has different and smaller inflorescence...
RiekoS: This flower is taller than Bellis perennis. I think it's Leucanthemum vulgare, but I don't know. :-)