1. Pollination “principles” revisited: specialization, pollination syndromes, and the evolution of flowers;Armbruster;Norske Vidensk.-Akad. I. Mat.-Naturvidensk. Kl., Skr., Ny Ser,2000
2. Die Verbreitung borealer und subantarktischer Holzgewächse in den Gebirgen des Tropengürtels;Bader;Nova Acta Leop.,1960
3. The comparative morphology of the Winteraceae. VII. Summary and conclusions;Bailey;J. Arnold Arbor,1945
4. The conduplicate carpel of dicotyledons and its initial trends of specialization;Bailey;Amer. J. Bot,1951
5. Ancient bisexual flowers;Basinger;Science,1984