1. Phytochemical differentiation of Myriophyllum taxa collected in British Columbia;Češka,1977
2. Studies on Ranunculus subgenus Batrachium. II: General morphological considerations in the taxonomy of the subgenus;Cook;Watsonia,1963
3. A monographic study of Ranunculus subgenus Batrachium (DC.) A. Gray;Cook;Mitt. bot. StSamml Münch,1966
4. Ranunculus subgenus Batrachium;Cook,1975
5. Sulphate esters of caffeyl and p-coumaryl glucose in ferns;Cooper-Driver;Phytochemistry,1975