Asulam was declared not approved by the "Commission Implementing Regulation (EU) No 1045/2011 of 19 October 2011 concerning the non-approval of the active substance asulam, in accordance with Regulation (EC) No 1107/2009 of the European Parliament and of the Council concerning the placing of plant protection products on the market, and amending Commission Decision 2008/934/EC (http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2011:275:0023:0024:EN:PDF).
^R. J. Pakemana, M. G. Le Ducb and R. H. Marrs (1998). "An assessment of aerially applied asulam as a method of long-term bracken control". Journal of Environmental Management53 (3): 255–262. doi:10.1006/jema.1998.0207.
^C. S. R. Snow and R. H. Marrs (1997). "Restoration of Calluna heathland on a bracken Pteridium-infested site in north west England". Biological Conservation81 (1-2): 35–42. doi:10.1016/S0006-3207(96)00147-4.
^R. I. Speight and J. B. Whittaker (1987). "Interactions Between the Chrysomelid Beetle Gastrophysa viridula, the Weed Rumex obtusifolius and the Herbicide Asulam". The Journal of Applied Ecology (British Ecological Society) 24 (1): 119–129. doi:10.2307/2403791. JSTOR2403791.