PERSSON, Kent et al.
 Non-destructive testing of the strength of glass by a non-linear ultrasonic method.
<strong>Challenging Glass Conference Proceedings</strong>, [S.l.], v. 7, sep. 2020.
ISSN 2589-8019.
Available at: &lt;<a href="https://journals.open.tudelft.nl/cgc/article/view/4498" target="_new">https://journals.open.tudelft.nl/cgc/article/view/4498</a>&gt;. Date accessed: 20 jan. 2021.
doi: <a href="https://doi.org/10.7480/cgc.7.4498">https://doi.org/10.7480/cgc.7.4498</a>.