Macedonians were recognized by the Greek Professor of History at the University of Athens, George Soteriadis, in 1918. In his book “An Ethnological Map Illustrating Hellenism In The Balkan Peninsula And Asia Minor” he recognizes the Macedonians under the term “Macedonian Slavs” and gives statistical information about the Macedonians and were they live according to his Ethnological Map.
Here is his book:
Makedonika: The Macedonian Blog 
20080416 at 23:14
Missing Greek comments here?
20080425 at 06:48
Voya,
We most definitely acknowledge “Macedonian Slavs’ (as Soteriadis states). If you accept you are Slavs, and you want to call yourselves Slav Macedonians, etc.., go ahead. Our issue is with your invention of the Macedonian ethnicity.
Commented by makedonika: So why does not Greece recognize her Macedonian Slavs then? The Macedonian ethnicity is not an invention, it is a FACT!
20080428 at 21:34
Voya Says: Missing Greek comments here? – ahahahahhahhahhahahaa GOOOODDDD ONEEEEE!!!!!