@article{CM_1975__31_2_115_0,
     author = {Dressler, Robert E.},
     title = {A property of the $\varphi $ and $\sigma _j$ functions},
     journal = {Compositio Mathematica},
     pages = {115--118},
     publisher = {Noordhoff International Publishing},
     volume = {31},
     number = {2},
     year = {1975},
     zbl = {0317.10008},
     language = {en},
     url = {http://www.numdam.org/item/CM_1975__31_2_115_0/}
}