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Evers, L.G. and H.W. Haak, Infrasonic forerunners: exceptionally fast acoustic phases
Dost, B. and H.W. Haak, Natural and Induced Seismicity
In Geology of the Netherlands, Th.E. Wong & J. de Jager ( (Ed), 2007, Amsterdam, Royal Netherlands Academy of Arts and Sciences, ISBN 978-90-6984-481-7, p223-239.
