Professor A F M Yousuf Haider at Dhaka University Physics Alumni Association, Curzon Hall, Dhaka University on 29.03.2019
<a href="//commons.wikimedia.org/wiki/User:Salim_Khandoker" title="User:Salim Khandoker">Salim_Khandoker</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>