1. Hamlet, Second Quarto 1604–5;Shakespeare,1964
2. Deterioration and conservation of vegetable tanned leathers: the Environment Leather Project;Larsen;Leather Conserv. News,1996
3. Analysis of the breakdown pattern of historical parchments;Larsen,1999
4. Sulphur distribution in parchment and leather exposed to sulphur dioxide;Bowden;J. Soc. Leather Technologists Chemists,2000
5. Sorption of sulphur dioxide by indoor surfaces III leathers;Spedding;J. Appl. Chem. Biotechnol.,1971