APA (7th ed.) Citation

Schulz, R. (1989). Some check digit systems over nonabelian groups.

Chicago Style (17th ed.) Citation

Schulz, Ralph-Hardo. Some Check Digit Systems over Nonabelian Groups. Berlin, 1989.

MLA (9th ed.) Citation

Schulz, Ralph-Hardo. Some Check Digit Systems over Nonabelian Groups. 1989.

Warning: These citations may not always be 100% accurate.