“EXISTENTIAL-PHENOMENOLOGICAL APPROACH TO THE TRANSFORMATION OF EDUCATIONAL CONTENT THROUGH THE ACTUALIZATION OF SCIENTIFIC HERITAGE: THE CASE OF O.M. TUTUNDZHYAN”, Educ-21st-Century, vol. 8, no. 1, pp. 10–28, Jun. 2026, doi: 10.46991/educ-21st-century.v8.i1.010.