1. Management of ingested foreign bodies in childhood;Spitz, L.;BMJ,1971
2. Foreign bodies and bezoars;Groff, D.B.,1986
3. Ingested foreign bodies in childhood;W, Moir Brown;BMJ,1971
4. Swallowed coins;editorial;Lancet,1989
5. Prolonged retention of foreign bodies in the stomach;Mandell, G.A.; Rosenberg, H.K.; Schnaufer, L.;Pediatrics,1977