@article{CM_1973__26_3_313_0,
     author = {Petersen, Karl},
     title = {On a series of cosecants related to a problem in ergodic theory},
     journal = {Compositio Mathematica},
     pages = {313--317},
     publisher = {Noordhoff International Publishing},
     volume = {26},
     number = {3},
     year = {1973},
     mrnumber = {325927},
     zbl = {0269.10030},
     language = {en},
     url = {http://www.numdam.org/item/CM_1973__26_3_313_0/}
}