Induction and restriction of representations

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In a field of pure mathematics called representation theory of Lie groups, I carried out for exponential solvable Lie groups, where the exponential map is a diffeomorphism from Lie algebra onto Lie group, a research related to the irreducible decomposition of induced representation from a 1-dimensional unitary character of a subgroup (monomial representation) and obtained the following results.1. If the multiplicity of a monomial representation in its irreducible decomposition is of discrete type, we could describe explicitly its Plancherel formula and show the commutativity of the associated algebra of invariant differential operators. We also found a negative example on a certain problem of Duflo.2. Gathering the results obtained until now by Grants-in-Aid for Scientific Research, I published a research book entitled "Unitary representations of exponential solvable Lie groups"(Sugaku-shobo, 2010, 352 pages).