@article{BSMF_1979__107__161_0,
     author = {Kubert, Daniel S. and Lang, Serge},
     title = {Modular units inside cyclotomic units},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {161--178},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {107},
     year = {1979},
     doi = {10.24033/bsmf.1890},
     mrnumber = {81k:12006},
     zbl = {0409.12007},
     language = {en},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.1890/}
}