@inbook{9f1a04e47f0d43018339042ec9fd94c3,
title = "Identification of core areas based on species distribution areas",
author = "S. Tworek and R. Reijnen and A. Dyduch-Falniowska and \{van Opstal\}, A.J.F.M.",
year = "2002",
language = "English",
isbn = "9789076762135",
pages = "53--58",
editor = "I.M. Bouwma and R.H.G. Jongman and R.O. Butovsky",
booktitle = "The indicative map of the pan-European ecological network for Central and Eastern Europe; technical background document",
publisher = "European Centre for Nature Conservation",
address = "Netherlands",
}