H̳₂ and H̳ [infinity symbol] control of a twin lift helicopter system

Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
In title on t.p., double underscored H is italic and "[infinity symbol] is subscript. T.p. verso defines italicized H as linear quadratic Gaussian.
Includes bibliographical references (p. 141-142).
by Carol J. Ouellette.
S.M.