▁middle ▁and ▁high ▁schools . ▁ ▁Prof . ▁N ay den ▁Apost ol ov ▁worked ▁as ▁a ▁deput y ▁director ▁in ▁the ▁know ▁" PR ▁S la vey kov " ▁in ▁V r ats a ▁from ▁ 1 0 ▁February ▁ 1 9 7 4 ▁to ▁ 1 ▁October ▁ 1 9 7 4 . ▁He ▁then ▁moved ▁with ▁his ▁family ▁in ▁Kar lo vo , ▁where ▁he ▁worked ▁as ▁an ▁inspect or ▁at ▁the ▁District ▁Council ▁from ▁ 6 ▁March ▁to ▁ 4 ▁November ▁ 1 9 7 5 . ▁During ▁this ▁time ▁he ▁applied ▁for ▁the ▁position ▁of ▁assistant ▁at ▁University ▁of ▁Econom ics ▁( at ▁this ▁time ▁called ▁V IN S ▁" Dim itar ▁B lag o ev ") ▁V arna , ▁won ▁the ▁competition ▁and ▁on ▁ 4 ▁November ▁ 1 9 7 5 ▁he ▁was ▁appointed ▁to ▁the ▁University . ▁On ▁ 1 ▁March ▁ 1 9 7 8 ▁he ▁was ▁promoted ▁to ▁senior ▁assistant , ▁and ▁on ▁ 2 1 ▁July ▁ 1 9 8 3 ▁– ▁to ▁assistant ▁professor . ▁On ▁ 3 ▁January ▁ 1 9 8 3 ▁he ▁was ▁awarded ▁the ▁academic ▁degree ▁candidate ▁of ▁ge ographical ▁sciences ▁( current ly ▁Ph D ) ▁of ▁the ▁High er ▁Att est ation ▁Commission ▁after ▁def ending ▁a ▁th esis ▁" Ge ographic ▁system at ization ▁in ▁studying ▁the ▁daily ▁work ▁comm ute ▁tri ps ▁in ▁Bulg aria ." ▁On ▁ 5 ▁July ▁ 1 9 8 9 ▁the ▁Scient ific ▁Committee ▁on ▁Ge ology ▁and