[1] Glyph Bitmap Distribution Format (BDF) Specification - 5005.BDF_Spec.pdf, 2021-02-18T01:31:12.000Z, 2022-09-30T08:13:20.208Z https://adobe-type-tools.github.io/font-tech-notes/pdfs/5005.BDF_Spec.pdf

[2] itouh: BDFについて, 2006-02-13T01:40:56.000Z, 2023-08-05T07:33:07.655Z http://hp.vector.co.jp/authors/VA013241/font/bdf.html