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1990
Crawford, Ian (1990) Interstellar travel: a review for astronomers. Quarterly Journal of the Royal Astronomical Society 31 , pp. 377-400. ISSN 0035-8738.
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Crawford, Ian (1990) Interstellar travel: a review for astronomers. Quarterly Journal of the Royal Astronomical Society 31 , pp. 377-400. ISSN 0035-8738.