After hearing Rachel reference this paper several times, I’ve finally gotten around to reading this paper:

Engle, R. and Conant, F. (2002). Guiding principles for fostering productive disciplinary engagement: Explaining an emergent argument in a community of learners classroom. Cognition and Instruction, 20(4), 399-483

The paper is fantastic for both its intellectual contributions and for the story line of the classroom phenomena.