Do you think if it's possible to got the birth certificate or the died certificate of my great grand parents : Alexandre Pavlowitch POTEMKINE but I don't know where is borned,
Yest, it is possible, but not through internet...;)
All that papers kept in the archives. When I have found that one (certificate) for my family of for my clients from USA and France, I ordered an official copy of it.
Is there a service where I can got these informations ?
You need to order the genealogical investigation for that - it is immpossible to find that information in Internet or in the books at home
There aere a LOT of VERY important informations (parent's applications, student's pictures for a few years, birth certificates etc.) in the student's private file in the colleges or University. But that data also keeps in the archive...