@article{10_1017_S001708950000450X,
     author = {Bertrand, D.},
     title = {Kummer theory on the product of an elliptic curve by the multiplicative group},
     journal = {Glasgow mathematical journal},
     pages = {83--88},
     year = {1981},
     volume = {22},
     number = {1},
     doi = {10.1017/S001708950000450X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950000450X/}
}