@article{00780175, title = {A stably free and non-free ring of integers. (Un anneau d'entiers stablement libre et non libre.)}, journal = {Experimental Mathematics}, volume = {3}, year = {1994}, pages = {129-136}, doi = {10.1080/10586458.1994.10504284}, zbl = {0837.11062}, language = {en}, url = {http://dml.mathdoc.fr/item/00780175} }
Cougnard, Jean. A stably free and non-free ring of integers. (Un anneau d'entiers stablement libre et non libre.). Experimental Mathematics, Tome 3 (1994) pp. 129-136. doi : 10.1080/10586458.1994.10504284. http://gdmltest.u-ga.fr/item/00780175/