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Business cycles, unemployment, and inflation
Robert E Schenk's Cyber Economics site has a text-driven explanation of the IS-LM model.
Philip Lane's 2001 JEL paper, The New Open Macroeconomics: A Survey, offers a technical (that is to say mathematical) overview of "the growing body of literature that attempts to address open economy issues in a dynamic general equilibrium version of the open economy with nominal rigidities and market imperfections" (Brian Doyle).