@article{10_1017_S0017089500002640,
     author = {Green, Edward L. and Reiten, Idun},
     title = {On the construction of ring extensions},
     journal = {Glasgow mathematical journal},
     pages = {1--11},
     year = {1976},
     volume = {17},
     number = {1},
     doi = {10.1017/S0017089500002640},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002640/}
}