Helen Vanhurk Sriwati Ningsih Sitorus
Observed names: Helen Sitorus Vanhurk Sriwati Ningsih Sitorus, Helen s Vanhurk Sriwati Ningsih Sitorus, Ningsih Sitorus, Helen Vanhurk Sriwati, Sitorus, Helen Vanhurk Sriwati Ningsih
Observed institution: Universitas Darma Agung
OpenAlex ID: A5083279804
