Looking for photos of a weapon: Need help finding them.?

It's called the Finnish Helenius APH-20. I have searched for about three hours on the web and got nothing. Any reason for the lack of info on it? Can you give me its history? I know it takes a 20mm round and another variant takes 12.7 x 99mm. Any pics or links would be greatly appreciated. I am familiar with the RT-20, NTW-20, and the Lahti L-39 though.