The Journal of Mathematical Behavior
Journal of Mathematical Behavior > 2006 > 25 > 4 > 334-344
Journal of Mathematical Behavior > 2006 > 25 > 4 > 318-333
Journal of Mathematical Behavior > 2006 > 25 > 4 > 334-344
Journal of Mathematical Behavior > 2006 > 25 > 4 > 318-333