1. Order of 13th October 1989 which establishes the methods for the Characterization of Toxic and Hazardous Wastes (Official State Bulletin of the 10th November, 1989, spain).
2. Solid Waste Leaching Procedure Manual,1985
3. Biological Test Method. Toxicity Test Using Luminiscent Bacteria (Photobacterium phosphoreum). Environmental Protection Series. Report EPS 1/RM/24, November 1992, Canada.