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IBM Tech. Disc. Bulletin, "Adapter for Half-Line Space Control", Heath, vol. 19, No. 5, Oct. 1976, pp. 1539-1541. |
IBM Tech. Disc. Bulletin, "Bidirectional Multiple-Pitch Automatic Word Underscore", Horst et al, vol. 21, No. 10, Mar. 1979, p. 3910. |
IBM Tech. Disc. Bulletin, "Optimization of Underscoring and Overstriking Operations in Word-Processing Printers", Daniels et al, vol. 26, No. 8, Jan. 1984, p. 4374. |
IBM Tech. Disc. Bulletin, "Printing Underscore Characters and Storing Representations Thereof", vol. 21, No. 6, Nov. 1978, pp. 2392-2393. |
IBM Tech. Disc. Bulletin, "Uniform Word Underscoring in Proportionality Spaced Printer", vol. 22, No. 6, Nov. 1979, pp. 2178-2182. |