Comparison of Various Guidance Strategies to Achieve Time Constraints in Optimal Descents Dalmau, Ramon ; Prats, Xavier ; Verhoeven, Ronald ; Bussink, Frank ; Heesbeen, Bart Abstract Publication: Journal of Guidance Control Dynamics Pub Date: July 2019 DOI: 10.2514/1.G004019 Bibcode: 2019JGCD...42.1612D