Author not established. Professor Tekie Fessehatzion. Date not established. EHREA archive: /library/documents/doc-9e4555cbccded68890f27cec/
[1] Professor Tekie Fessehatzion. Original source: http://www.ehrea.org/abdh.php. Preserved original: /library/originals/de5578acbe48248f0fd7020c570da9bce6b4492d9e1bdafacea908062999d6af.html. SHA-256: de5578acbe48248f0fd7020c570da9bce6b4492d9e1bdafacea908062999d6af