1. H. Billing, “Zur Entwicklungsgeschichte der digitalen Speicher”. Elektron. Rechenanlagen 19, p. 213–217, May 1977
2. A. Bobeck et al., “Magnetic Bubbles: An emerging new Memory Technology”, Proc. IEEE, vol 63, p. 1176, 1975
3. D. Bowers, “Floppy Disk Drives and Systems”, Mini-Micro Syst. 10, p. 36, 1977
4. H. Chang, “Magnetic-Bubble Memory Technology”, Marcel Dekker, 1978
5. E.D. Councill et al., “A 275-Nanosecond Coincident Current Ferrite Memory”, Digest of the Intermag Conference Washington DC, April 1970