1. Clinical trial with inactivated hepatitis A vaccine and recommendations for its use;Tilzey, A.J.; Palner, S.J.; Barrow, S.; Perry, K.R.; Tyrell, H.; Safary, A.;BMJ,1992
2. Hepatitis A; a vaccine at last;editorial,1992
3. Outbreak of infective hepatitis amongst sewage sludge spreaders;Timothy, E.M.; Mephan, P.;Communicable Disease Report,1984
4. Infectious liver diseases in three groups of Copenhagen workers: correlation of hepatitis A infection to sewage exposure;Skinhoj, P.; Hollinger, F.B.; Hovind-Hougen, K.; Lous, P.;Arch Envisron Health,1981
5. Giardiasis and occupational risk in sewage workers;Heap, B.J.; McCulloch, M.L.B.;Lancet,1991