1. Circular Statistics in Biology;Batschelet,1981
2. Tactic components in orientation;Campan,1997
3. The relation between celestial colour gradients and the position of the sun, with regard to the sun compass;Coemans;Vision Research,1994
4. An optical directional factor in the sky might improve the direction finding of sandhoppers on the seashore;Ercolini;Monitore Zoologico Italiano,1983
5. Polarized Light in Animal Vision;Horvath,2004