@article {2208,
	title = {Calculation of von Neumann entropy for hydrogen and positronium negative ions},
	journal = {Physics Letter A},
	volume = {378},
	year = {2014},
	pages = {2861-2865},
	attachments = {https://labs.iams.sinica.edu.tw/project/sites/default/files/ykho/files/2014_5.pdf},
	author = {Chien-Hao Lin and Ho, Yew Kam}
}
