Wave-length standards in the extreme ultra-violet

[1] *BUR STAND, 1919, BUR STAND B, V14, P731

[2] HOPFIELD, 1922, NATURE, V110, P732

[3] HOPFIELD, 1922, PHYS REV, V20, P573

[4] 1909, ASTROPHYSICAL J, V30, P48

[5] 1916, ASTROPHYSICAL J, V43, P89

[6] 1914, P ROYAL SOC LONDON A, V90, P605

[7] 1914, Z WISS PHOT, V14, P144

[8] 1921, T ROYAL SOC CANADA 3

[9] 1921, ASTROPHYSICAL J, V53, P150

[1] *BUR STAND, 1919, BUR STAND B, V14, P731

[2] HOPFIELD, 1922, NATURE, V110, P732

[3] HOPFIELD, 1922, PHYS REV, V20, P573

[4] 1909, ASTROPHYSICAL J, V30, P48

[5] 1916, ASTROPHYSICAL J, V43, P89

[6] 1914, P ROYAL SOC LONDON A, V90, P605

[7] 1914, Z WISS PHOT, V14, P144

[8] 1921, T ROYAL SOC CANADA 3

[9] 1921, ASTROPHYSICAL J, V53, P150