The Differentiable Structure of Three Remarkable Diffeomorphism Groups. Rudolf Schmid; Tudor Ratiu — 1981 Mathematische Zeitschrift
A Lie Group Structure for Fourier Integral Operators. Malcolm Adams; Rudolf Schmid; Tudor Ratiu — 1986 Mathematische Annalen
A Lie Group Structure for Pseudodifferential Operators. Malcolm Adams; Tudor. Ratiu; Rudolf Schmid Mathematische Annalen
Infinite-dimensional Lie groups and algebras in mathematical physics. Schmid, Rudolf — 2010 Advances in Mathematical Physics