Deckenbrugge, GC. (1990). The Progamic Phase in Cichorium-intybus L Pollen-tube Growth in the Style, Incompatibility Reaction and Gametophytic Competition. Euphytica : international journal on plant breeding, 48(1), 17-23. https://hdl.handle.net/2078.5/138348 (Original work published 1990)