@article{10_21136_CMJ_2023_0395_22,
     author = {Sun, Zhi-Wei},
     title = {The tangent function and power residues modulo primes},
     journal = {Czechoslovak Mathematical Journal},
     pages = {971--978},
     publisher = {mathdoc},
     volume = {73},
     number = {3},
     year = {2023},
     doi = {10.21136/CMJ.2023.0395-22},
     mrnumber = {4632869},
     zbl = {07729549},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.2023.0395-22/}
}