21
Published: 1986
Superior document: Trudy po znakovym sistemam 19
22
Published: 1990
Superior document: Tartu Ülikooli toimetised 897
23
Published: 1986
Superior document: Tartu Riikliku Ülikooli toimetised / Tartuskij Gosudarstvennyj Universitet 683
24
Published: 1971
Superior document: Trudy po znakovym sistemam 5