See http://www.hear.org/gcw/species/ranunculus_ficaria/

A large number of references were given by the Weed Science Group Department of Agriculture, Western Australia:

Virginia Native Plant Society (1998) Alien Invasive plants in Virginia. Virginia Native Plant Society (PO Box 844, Annandale, VA 22003) Division of Natural Heritage. www.state.va.us/~vaher.html Ernst Hafliger, (Basle), and Josef Brun-Hool, (Lucerne) (1968-) CIBA-GEIGY WEED tableS A synoptic presentation of the flora accompanying agricultural crops. Williams, G.H. (1982). Elseviers’s Dictionary of Weeds of Western Europe. Elsevier Scientific Publishing Company Amsterdam, Holland. Holm, L.G., Pancho, J.V., Herberger, J.P. and Plucknett, D.L. (1979). A Geographical Atlas of World Weeds. John Wiley and Sons, New York, USA. Introduced (Naturalised) Species to the United States [USDA, NRCS 1999. The PLANTS database. National Plant Data Center, Baton Rouge, LA 70874-4490 USA. ] Leslie J. Mehrhoff (1999) Non-native Invasive Plant Species Occurring in Connecticut. Revised Edition . George Safford Torrey Herbarium. Connecticut Invasive PlantWorking Group. PLUS The Non-Native Invasive & Potentially Invasive Vascular Plants in Connecticut. CT Geological and Natural History Survey USDA Forest Service Eastern Region, Section 3B. Eastern Region invasive plants, ranked by degree of invasiveness as based on information from States. http://www.fs.fed.us/r9/wildlife/range/weed/?open=Sec3B.htm State Noxious Weeds of the USA. – State and Federal Composite List of All U.S. Noxious Weeds. USDA, NRCS 1999. The PLANTS database. National Plant Data Center, Baton Rouge, LA 70874-4490 USA. Unité de Malherbologie & Agronomie Weed Science & Agronomy INRA-Dijon This encyclopedic database on plant protection catalogues the main weeds (580) of western Europe, describes the species at two stages: mature plants and seedlings, and provides information on their taxonomy, their distribution and their ecology. Copyright (c) 2000 INRA, all rights reserved ; J.-P. Lonchamp, Nov. 2000 http://www2.dijon.inra.fr/hyppa/hyppa-a/hyppa_a.htm Williams, G. and Hunyadi, K. (1987). Dictionary of Weeds of Eastern Europe: Thier common names and importance in Latin, Albanian, Bulgarian, Czech, German, English, Greek, Hungarian, Polish, Romanian, Russian, Serbo-Croat and Slovak. Elsevier. Amsterdam. Preston, C.D., Pearman, D.A. and Dines, T.D. (2002) New Atlas of the British & Irish Flora. An Atlas of the Vascular Plants of Britain, Ireland, the Isle of Man and the Channel Islands. Oxford University Press. Bargeron, C.T., D.J. Moorhead, G.K. Douce, R.C. Reardon & A.E. Miller (Tech. Coordinators). 2003. Invasive Plants of the Eastern U.S.: Identification and Control. USDA Forest Service – Forest Health Technology Enterprise Team. Morgantown, WV USA. FHTET-2003-08 (CD version: Nov 2003) Global Invasive Species Database was developed by the IUCN/SSC Invasive Species Specialist Group (ISSG) as part of the global initiative on invasive species led by the Global Invasive Species Programme (GISP). http://www.issg.org/database/welcome/default.asp I’m sure CABI and other sources will yield even more literature on this species.