▁p .   1 7 8 ▁▁ ▁( co - author ed ▁with ▁Stefan ▁At anas ov ▁Ts one v ▁Ned el cho ▁Mark ov ▁E ne v , ▁El ena ▁At anas ova ▁Pet k ova , ▁S vet la ▁Gen ova ▁Rak ad z hi y ska , ▁Hr . ▁Co ats , ▁Mar in ▁Na iden ov ▁N esh kov , ▁Bel che va ▁Tat iana ▁H rist ova , ▁Stefan ▁Bor is ov ▁K ach am akov ▁M . ▁D zh ark ova ▁M . ▁M lad en ova ) ▁State ▁and ▁prospect s ▁for ▁development ▁of ▁business ▁tour ism ▁and ▁recre ation ▁workers ▁in ▁Vel iko ▁T arn ovo ▁district ▁for ▁the ▁period ▁ 1 9 9 0 ▁– ▁ 2 0 0 0 . ▁V arna , ▁V IN S ▁D . B lag o ev , ▁ 1 9 8 5 , ▁p .   2 6 4 ▁ ▁( co - author ed ▁with ▁El ena ▁Pet ro va ▁At anas ova , ▁S vet la ▁Gen ova ▁Rak ad z hi y ska ▁Mar in ▁Na iden ov ▁N esh kov , ▁Ivan ▁Pet kov ▁Kal v ache v , ▁Bel che va ▁Tat iana ▁H rist ova , ▁Stefan ▁Bor is ov ▁K ach am akov , ▁Sto yan ▁T ane v ▁Val chev ) ▁State ▁and ▁prospect s ▁for ▁development ▁of ▁business ▁tour ism ▁in ▁the ▁T P ▁' B alk ant ur ist ▁"- ▁St . ▁Zag ora ▁[ to ▁year