Gratings of constantly varying depth for visual security devices
Keyword(s):
2008 ◽
Vol 19
(2)
◽
pp. 153-181
◽
2020 ◽
Vol 7
(1/2/3)
◽
pp. 250
Keyword(s):
2016 ◽
Vol 46
◽
pp. 60-75
◽