Effects of Local Density on Insect Visitation and Fertilization Success in the Narrow-Endemic Centaurea corymbosa (Asteraceae) - Kirchner, Florian; Luijten, Sheila H.; Imbert, Eric; Riba, Miquel; Mayol, Maria; González-Martínez, Santiago C.; Mignot, Agnès; Colas, Bruno; Memmott, Jane (Oikos, 2005)