APA (7th ed.) Citation

Tolue, B., Zolfaghari, P., & Moghaddasi, G. (2019). Free ultra-groups, generators and relations. Algebra and Discrete Mathematics.

Chicago Style (17th ed.) Citation

Tolue, B., P. Zolfaghari, and Gh Moghaddasi. "Free Ultra-groups, Generators and Relations." Algebra and Discrete Mathematics 2019.

MLA (8th ed.) Citation

Tolue, B., et al. "Free Ultra-groups, Generators and Relations." Algebra and Discrete Mathematics, 2019.

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