References
Cross, M. (1990) ‘Technology: Japanese space research comes down to Earth’, New Scientist, 22 September [Online]. Available at www.newscientist.com/article/mg12717352-900-technology-japanese-space-research-comes-down-to-earth/ (Accessed 21 September 2018).
Hill, C. R., Heißelmann, D., Blum, J. and Fraser, H. J. (2014) Collisions of small ice particles under microgravity conditions [Online]. Available at https://arxiv.org/ abs/ 1411.0563 [Tip: hold Ctrl and click a link to open it in a new tab. (Hide tip)] (Accessed 21 September 2018).