鈥淭he Mathematics of Foreign Exchange.鈥� 
鈥淎 Generalized Profit Function.鈥�
鈥淓mpirically Estimated 鈥楾rue鈥� PPP Indexes.鈥�
鈥淎 Graphical Depiction of Hicksian Partial-Equilibrium Welfare Analysis.鈥�
鈥淐omparing Price Levels across Countries using Minimum Spanning Trees.鈥�