Quizá quiso decir: Developments in Environmental Biology of Fishes 27, 0924-5316 ; 27 ISO 27002 Series Standards. Normas ISO 27002. Universitas. ; 27. Población ; 27/2007. Recerca ; 27. SEP 80/27. Arcadia ; 27. Universitas. ; 27. Población ; 27/2007. Cátedra ; 27. Arcadia ; 27. IFIP The International Federation for Information Processing, 1868-4238 ; 270 IFIP The International Federation for Information Processing, 1571-5736 ; 271 IFIP International Federation for Information Processing, 1571-5736 ; 272 IFIP International Federation for Information Processing, 1571-5736 ; 273 IFIP The International Federation for Information Processing, 1868-4238 ; 274 IFIP The International Federation for Information Processing, 1571-5736 ; 275 IFIP The International Federation for Information Processing, 1868-4238 ; 276 The International Federation for Information Processing, 1868-4238 ; 277