多重根号
↑ 百科事典マイペディア『無理式』 - コトバンク
↑ "A note on 'Zippel Denesting'", Susan Landau, http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.35.5512&rep=rep1&type=pdf
↑ "RADICALS AND UNITS IN RAMANUJAN’S WORK", Susan Landau, http://www.math.uiuc.edu/~berndt/articles/radicals.ps
↑ Landau, Susan (1992). “Simplification of Nested Radicals”. Journal of Computation (SIAM) 21: 85-110. doi:10.1109/SFCS.1989.63496. CiteSeer: 10.1.1.34.2003.