Bactra Review    A Future for Socialism
See Benjamin E. Lippincott (ed.), On the Economic Theory of Socialism (first published by the University of Minnesota Press, 1938, but more commonly found in the reprint by McGraw-Hill, 1964) for Lange's article of the same title. If memory serves, Lange was a lecturer at the University of Chicago at the time; I don't know whether this contributed to his proposal at all.