Author not established. part-5. Date not established. EHREA archive: /library/documents/doc-a336a4cfe10f08301118a178/
[1] part-5. Original source: http://www.ehrea.org/Part5.pdf. Preserved original: /library/originals/1abb237c1fc86efb8f6325b3c3c4cb8dd50eaf18f9492f56b0a483ab21e5247c.pdf. SHA-256: 1abb237c1fc86efb8f6325b3c3c4cb8dd50eaf18f9492f56b0a483ab21e5247c