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Goddard problem
In rocketry, the Goddard problem is to optimize the altitude of a rocket, ascending vertically, and taking into account atmospheric drag and the gravitational field. This was first posed by Robert H. Goddard in his 1919 publication, "A Method of Reaching Extreme Altitudes".[1][2]
References
http://www.aoe.vt.edu/~cliff/aoe5244_99/week_13_a.pdf
http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0409855
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