APA (7th ed.) Citation

Liu, W. (1991). A robustness measure for the sign detector. [publisher not identified].

Chicago Style (17th ed.) Citation

Liu, Wensheng. A Robustness Measure for the Sign Detector. [Place of publication not identified]: [publisher not identified], 1991.

MLA (9th ed.) Citation

Liu, Wensheng. A Robustness Measure for the Sign Detector. [publisher not identified], 1991.