Benefit Transfer in Europe: How Reliable Are Transfers between Countries?
Richard Ready, Ståle Navrud, Brett Day, Richard Dubourg, Fernando Machado, Susana Mourato, Frank Spanninks, Maria Xosé Vázquez Rodriquez
Environmental and Resource Economics, vol. 29, 2004, p. 67-82.

Contingent Valuation of Ill Health Caused by Pollution: Testing for Context and Ordering Effects
Richard Ready, Ståle Navrud, Brett Day, Richard Dubourg, Fernando Machado, Susana Mourato, Frank Spanninks, Maria Xosé Vázquez Rodriquez
Portuguese Economic Journal, vol. 3, 2004, p. 145-156.