Growth-Optimal Strategies with Quadratic Friction Over Finite-Time   Investment Horizons
  We investigate the growth optimal strategy over a finite time horizon for a stock and bond portfolio in an analytically solvable multiplicative Markovian market model. We show that the optimal strategy consists in holding the amount of capital invested in stocks within an interval around an ideal optimal investment. The size of the holding interval is determined by the intensity of the transaction costs and the time horizon. 
E. Aurell, P. Muratore-Ginanneschi