− | * Kop P.M.G.M., Janssen F.J.J.M., Drijvers P.H., Veenman M.V. & Van Driel J.H. (2015), Identifying a framework for graphing formulas from expert strategies, The Journal of Mathematical Behavior, 39: 131-134. | + | * Kop P.M.G.M., Janssen F.J.J.M., [[Paul Drijvers|Drijvers P.H.]], Veenman M.V. & Van Driel J.H. (2015), Identifying a framework for graphing formulas from expert strategies, The Journal of Mathematical Behavior, 39: 131-134. |