1. R.Agliardi - D.Mari,On the Cauchy problem for some pseudo-differential equations of Schrödinger type, to appear on Math. Models Meth. in Appl. Sci.
2. W. Ichinose, Sufficient condition on H∞ well-posedness for Schrödinger type equations, Comm. in P.D.E.,9 (1984), pp 33–48.
3. W. Ichinose,Some remarks on the Cauchy problem for Schrödinger type equations, Osaka J. Math.,21 (1984), pp. 565–581.
4. W. Ichinose,The Cauchy problem for Schrödinger type equations with variable coefficients, Osaka J. Math.,24 (1987), pp. 853–886.
5. H. Kitada,Fundamental solutions and eigenfunction expansions for Schrödinger operators. I: Fundamental solutions, Math. Z.,198 (1988), pp. 181–190.