1. The buffer effect and productivity in tit populations;Brown;Amer. Nat.,1969
2. Wildfowl and wader counts 1991–1992;Cranswick,1992
3. Disturbance to waterfowl on estuaries;Davidson;Wader Study Group Bull.,1993
4. Nature conservation and estuaries in Great Britain;Davidson,1991
5. Oxford and Cambridge Mauritania Expedition 1973,1975