@article{CM_1967__18_1-2_61_0,
     author = {Hsiang, Fu Cheng},
     title = {On the {Fourier} coefficients of a simple discontinuous function},
     journal = {Compositio Mathematica},
     pages = {61--64},
     publisher = {P. Noordhoff N. V., Groningen},
     volume = {18},
     number = {1-2},
     year = {1967},
     mrnumber = {221189},
     zbl = {0167.05401},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1967__18_1-2_61_0/}
}