00281nam a2200097Ia 4500008004100000082002200041100001600063245005500079260003300134300001600167260423b        |||||||| |||| 00| 0 eng d  a338.901bSh544.ET  aShell, Karl  aEssays on the theory of optimal economic growthb/  aCambridge:bMIT Press,c1967  axiii, 303p.