1. Acker, A.: Heat flow inequalities with applications to heat flow optimization problems. SIAM J. math. Analysis 8, 604–618 (1977)
2. Acker, A.: A free boundary optimization problem. SIAM J. math. Analysis (to appear).
3. Acker, A.: Isoperimetric inequalities involving heat flow under linear radiation conditions. Proc. Amer. math. Soc. (to appear).
4. Acker, A.: An isoperimetric inequality involving conformai mapping. Proc. Amer. math. Soc. (to appear).
5. Acker, A.: A free boundary optimization problem involving weighted areas. Submitted.