Ecosystem services in European protected areas: Ambiguity in the views of scientists and managers? oleh Christiaan Hummel, Antonello Provenzale, Jaap van der Meer, Sander Wijnhoven, Arno Nolte, Dimitris Poursanidis, Guyonne Janss, Matthias Jurek, Magnus Andresen, Brigitte Poulin, Johannes Kobler, Carl Beierkuhnlein, João Honrado, Arturas Razinkovas, Ana Stritih, Tessa Bargmann, Alex Ziemba, Francisco Bonet-García, Mihai Cristian Adamescu, Gerard Janssen, Herman Hummel