1. Baues, H.-J.: Geometry of loop spaces and the cobar construction. Mem. Am. Math. Soc.25, 230 (1980)
2. Billera, L.J., Filliman, P., Sturmfels, B.: Constructions and complexity of secondary polyhedra. Adv. Math.83, 155?179 (1990)
3. Billera, L.J., Kapranov, M.M., Sturmfels, B.: On a conjecture of Baues in the theory of loop spaces. Technical Report 91-19, Math. Sci. Institute of Cornell University, Ithaca, 1991 (to appear in Bull. Am. Math. Soc.)
4. Billera, L.J., Sturmfels, B.: Fiber polytopes, Ann. Math. (to appear)
5. Billera, L.J., Sturmfels, B.: Coherent homotopies of polyhedral subdivisions. In preparation