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Gregorove tajné výpravy do vesmíru / Lucy a Stephen Hawkingovci s Christophom Galfardom ; ilustroval Garry Parsons. - 1. slov. vyd. - Bratislava : Slovart, 2008 - 301 s. ISBN 978-80-8085-496-6 [3, currently available 3, Access to Shelves 3]