https://netlib.org/na-digest-html/21/v21n23.html
[NADIGEST] NA Digest, V. 21, # 23
v 21nadigest23
https://netlib.org/na-digest-html/21/v21n26.html
[NADIGEST] NA Digest, V. 21, # 26
v 21nadigest26
https://netlib.org/na-digest-html/21/v21n28.html
[NADIGEST] NA Digest, V. 21, # 28
v 21nadigest28
https://netlib.org/na-digest-html/21/v21n27.html
[NADIGEST] NA Digest, V. 21, # 27
v 21nadigest27