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Metódy spracovania experimentálnych údajov / Ludmila Kubáčková . Bratislava :  Veda , 1990 . 324 s . ISBN 80-224-0104-8 . [5, of that borrowed 1]

The science and technology of building materials / Henry J. Cowan, Peter R. Smith . New York :  Van Nostrand Reinhold Co. , 1988 . 213 s . ISBN 0-442-21799-4 . [1, of that borrowed 0]