Y Naruo, Y Inatani, Y Morita, S Nakai & H Mori, July 15-18, 1997, "Throttling Dynamic Response of LH2 Rocket Engine for Vertical Landing Rocket Vehicle", Presented at the 7th International Space Conference of Pacific Basin Societies (
ISCOPS, formerly PISSTA), July 15-18, 1997, Nagasaki, JAPAN. Paper No.
AAS 97-421.
Also downloadable from
http://www.spacefuture.com/archive/throttling dynamic response of lh2 rocket engine for vertical landing rocket vehicle.shtml