Fountain Pens

I have heard several times some fountain pen enthusiasts reference a study that showed that taking notes with a pen and paper encouraged more active engagement, and better retention of material being presented in a class or a conference, than people using a laptop, tablet, etc. (ie, typing).

Does anyone know the exact reference for this study? Most of the time I only hear vague references like "a study found..." or "a study conducted at XYZ University", and I would like to find the actual study and read it for myself.