%0 Journal Article %T Foveal flicker-fusion frequencies: a simple, new apparatus (4F) %A Neetens, Adolphe %A Ende, Patricia %J Graefe's Archive for Clinical and Experimental Ophthalmology %V 230 %N 4 %P 358-361 %@ 0721-832X %D 2004-06-28 %I Springer-Verlag %~ DeepDyve