In Which Models do Mutual Fund Theorems Hold True?  (with W. Schachermayer and E. Taflin)
    Finance and Stochastics, Vol 13 (2009), 49-77
     Asymptotic Analysis of Utility-Based Hedging Strategies for Small Number of Contingent Claims (with D. Kramkov)
     Stochastic Processes and their Applications, Vol 117, No. 11 (2007), 1606-1620
    Sensitivity Analysis of Utility-Based Prices and Risk-Tolerance Wealth Processes (with D. Kramkov)
    Annals of Applied Probability, Vol. 16, No. 4 (2006), 2140-2194
     A Two-Person Game for Pricing Convertible Bonds (with S.E. Shreve)
    SIAM Journal on Control and Optimization Vol.  45, No. 4 (2006), 1508-1539 
     On the Two-Times Differentiability of the Value Functions in the Problem of Optimal Investment in Incomplete Markets (with D. Kramkov)
    Annals of Applied Probability, Vol. 16, No. 3 (2006), 1352-1384
      Perpetual Convertible Bonds  (with I. Pikovsky and S.E. Shreve)
    SIAM Journal on Control and Optimization, Vol 43, No.1 (2004), 58-85
    Infinite Time Horizon Optimal Control of the Semilinear Heat Equation
    Nonlinear Functional Analysis and Applications,  Vol. 7 No. 1 (2002), 69-83
    A Riccati  Equation Approach to the Null Controllability of Linear Systems
    Communications in Applied Analysis, Vol. 6, No. 2 (2002),  163-177
    Feedback Null Controllability of the Semilinear Heat Equation 
    Differential Integral Equations, Vol. 15 No.1 (2002),  115-128
     Null Controllability of an Infinite Dimensional SDE with State-and-Control Dependent Noise  (with G. Tessitore)
    Systems & Control Letters, Vol. 44 No. 5 (2001),  385-394