Urnebes is a Serbian salad that contains cheese. Searching for recipes for said salad, I noticed that there are a lot of difference in the chosen cheese. Some say feta, some say cottage cheese, some say sour cream, some say a mixture of those, etc.
While I think the authentic cheese would be a Serbian one, I discovered that the Serbian cuisine has a version of each of those kind of cheeses.
Which Serbian cheese is the used cheese for making urnebes and (assuming I won't get my hands on that kind of cheese) what is its best substitute?