Nicolae Anghel. On a Question of Connes and Zagier Regarding Parallelograms Inscribed in a Pair of Confocal Ellipses. The American Mathematical Monthly, 117(9):828-831, 2010. [doi]
@article{Anghel10,
title = {On a Question of Connes and Zagier Regarding Parallelograms Inscribed in a Pair of Confocal Ellipses},
author = {Nicolae Anghel},
year = {2010},
doi = {10.4169/000298910X521706},
url = {http://dx.doi.org/10.4169/000298910X521706},
researchr = {https://researchr.org/publication/Anghel10},
cites = {0},
citedby = {0},
journal = {The American Mathematical Monthly},
volume = {117},
number = {9},
pages = {828-831},
}