Hongjian Li, Pingzhi Yuan, Hairong Bai. Positive Rational Numbers of the Form φ ( m 2 ) / φ ( n 2 ). The American Mathematical Monthly, 128(2):174-176, 2021. [doi]
@article{LiYB21,
title = {Positive Rational Numbers of the Form φ ( m 2 ) / φ ( n 2 )},
author = {Hongjian Li and Pingzhi Yuan and Hairong Bai},
year = {2021},
doi = {10.1080/00029890.2021.1850142},
url = {https://doi.org/10.1080/00029890.2021.1850142},
researchr = {https://researchr.org/publication/LiYB21},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {128},
number = {2},
pages = {174-176},
}