By Barbier, M.
By Conway, Gordon R., Barbier, Edward
By Pearce, David, Barbier, Edward, Markandya, Anil
By Barbier, Edward, Burgess, JoAnne, Folke, Carl
By Barbier, Bruno
By Barbier, Maurice
By Pearce, David, Barbier, Edward B., Markandya, Anil