@Article{NM-14-97,
author = { S. Yang and Q. Cai},
title = {On Oppenheim's inequality},
journal = {Numerical Mathematics, a Journal of Chinese Universities},
year = {2005},
volume = {14},
number = {2},
pages = {97--101},
abstract = {},
issn = {},
doi = {https://doi.org/},
url = {http://global-sci.org/intro/article_detail/nm/8002.html}
}