1. Conservation of earth structures;Warran,1990
2. Conservation of wall painting;Mora,1984
3. Earth conservation, a comprehensive guide;Houben,1984
4. Study of the conservation of decorated surface at the site of Haucade la Luna and ER Brujo;Leslie,1995
5. Cather S, Assessing causes and mechanism of detrimental changes to wall painting. In: Gowing R, Heritage A, editors. Conserving the painted past: post prints of the conference organized by the English Heritage, London, 3–4 December 1999, London English Heritage, pp. 67–74.