Researching Finnish Winter War casualty - Urho Vienonen

Good Evening!

I am doing some research on the Finnish Army during the Second World War (1939-40) and wondered if anybody could help in pointing me in the right direction for finding information about Finnish individuals who died in the winter war. I am looking for any information related to Urho Vienonen who was killed, from what i have researched so far there doesn't seem to be much information available on cemeteries and war dead. Could anybody help in pointing me in the right direction??

Many Thanks

TJames