Blömer, J. (2002). Computing sums of radicals in polynomial time. [1991] Proceedings 32nd Annual Symposium of Foundations of Computer Science.https://doi.org/10.1109/sfcs.1991.185434 

Blömer, J. (1991). Computing sums of radicals in polynomial time. In Proceedings 32nd Annual Symposium of Foundations of Computer Science. IEEE Comput. Soc. Press.https://doi.org/10.1109/sfcs.1991.185434