Issue No.05 - May (1979 vol.12)
D. Michalopoulos , California State University
By the simple tactic of using two distinct types of magnetic bubbles, IBM scientists have increased the information storage density of a conventionally designed magnetic bubble device by a factor of four.
D. Michalopoulos, "New Applications & Recent Research", Computer, vol.12, no. 5, pp. 89-90, May 1979, doi:10.1109/MC.1979.1658756