@article{Burt_1969,<br/><span class="tab"></span> title={Optimum functions for mass and energy flow in space manoeuvres},<br/><span class="tab"></span> volume={312},<br/><span class="tab"></span> ISSN={2053-9169},<br/><span class="tab"></span> url={http://dx.doi.org/10.1098/rspa.1969.0144},<br/><span class="tab"></span> DOI={10.1098/rspa.1969.0144},<br/><span class="tab"></span> number={1508},<br/><span class="tab"></span> journal={Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences},<br/><span class="tab"></span> publisher={The Royal Society},<br/><span class="tab"></span> author={Burt,<br/><span class="tab"></span> E. G. C.},<br/><span class="tab"></span> year={1969},<br/><span class="tab"></span> month=aug,<br/><span class="tab"></span> pages={99–128} }