Keyword detection in natural languages and DNA M. Ortuño, P. Carpena, P. Bernaola-Galván, E. Muñoz and A. M. Somoza Europhys. Lett., 57 5 (2002) 759-764 Published online: 01 September 2002 DOI: 10.1209/epl/i2002-00528-3