Dear Doug,
on Lautenbach I suggest to read as a starter
Juergen Backhaus, 'Keynesianism in Germany', in
Tony Lawson, Hashem Pesaran (eds.), Keynes' Economics.Methodological Issu=
es,
London/New York 1985: Routledge, pp.209-253.
The article contains a long list of references for further reading.
Harald Hagemann