@article{10_1017_S001708950000759X,
     author = {Jordan, D. A.},
     title = {Unique factorisation of normal elements in non-commutative rings},
     journal = {Glasgow mathematical journal},
     pages = {103--113},
     year = {1989},
     volume = {31},
     number = {1},
     doi = {10.1017/S001708950000759X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950000759X/}
}