This tool allows you to create a PDF certificate for items published in the Camtree Digital Library.
You will need to enter the item's DSpace Handle which will look something like this (you'll find it on the item's page in the library):
It is the string of numbers starting '20.500...' that you need - you can either enter just that part, or the whole URL.
Don't enter the item's DOI number, if it has one, or the long URL that appears in your browser's address bar.