Yambot, M., 		Mendenilla, A., 		Valmoria, N., 		Ramos, H., & 		Garcia, A.
(2007).
 Negative Ion Beam Focusing in a Plasma Sputter-type Negative Ion Source.
<em>Science Diliman: A Journal Of Pure And Applied Sciences, 11</em>(2).
Retrieved from <a href="https://journals.upd.edu.ph/index.php/sciencediliman/article/view/243" target="_new">https://journals.upd.edu.ph/index.php/sciencediliman/article/view/243</a>