1. The biology of canadian weeds. 34. Myriophyllum spicatum L. Can;Aiken;J. Plant Sci.,1979
2. De opmars van Grote waternavel (Hydrocotyle ranunculoides L.f.) in Nederland, 1996–1998;Baas;Gorteria,1998
3. Hydrocotyle ranunculoides L.f.: infiltrant in waterland?;Baas;Gorteria,1996
4. Hydrocotyle ranunculoides L.f. (Grote waternavel): de stand van zaken;Baas;Gorteria,1996
5. Alien Plants of the British Isles;Clement,1994