Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Uri Abraham. Aronszajn trees on ℵ2 and ℵ3. Annals of pure and applied logic, vol. 24 (1983), pp. 213–230.-James Cummings and Matthew Foreman. The tree property. Advances in mathematics, vol. 133 (1998), pp. 1–32.-Menachem Magidor and Saharon Shelah. The tree property at successors of singular cardinals. Archive for mathematical logic, vol. 35 (1996), pp. 385–404.