The colors of reflection nebulae

[1] The colour of the nebulous stars [J]. ASTROPHYSICAL JOURNAL, 1920, 52 (01) : 8 - 22

[2] 1936, AP J, V84, P203

[3] 1934, Z AP, V8, P168

[4] 1937, AP J, V86, P529

[5] NATL RES FELLOW

[1] The colour of the nebulous stars [J]. ASTROPHYSICAL JOURNAL, 1920, 52 (01) : 8 - 22

[2] 1936, AP J, V84, P203

[3] 1934, Z AP, V8, P168

[4] 1937, AP J, V86, P529

[5] NATL RES FELLOW