@unpublished{169_PREPRINT,
 Author = {Constantin Christof and Gerd Wachsmuth},
 Note = {Preprint SPP1962-169},
 Title = {Lipschitz Stability and Hadamard Directional Differentiability for Elliptic and Parabolic Obstacle-type Quasi-variational Inequalities},
 Month = {5},
 Year = {2021}}