1. Allen, T. F. H., Hierarchy, Perspectives for Ecological Complexity: 230 (1982).
2. Allen, T. F. H., Proceedings of the 24th Annual North American Meeting, Society for General Systems Research: 96 (1980).
3. ANDERSON, E, ANNALS OF THE MISSOURI BOTANICAL GARDEN 31: 325 (1944).
4. ANDERSON, E, ANNALS OF THE MISSOURI BOTANICAL GARDEN 35: 323 (1948).
5. ASCHERSON, P, VERHANDLUNGEN DES BOTANISCHEN VEREINS DER PROVINZ BRANDENBURG 21: 133 (1880).