APA (7th ed.) Citation

Cui, C., Qi, L., & Xu, Y. Positive Semi-Definite and Sum of Squares Biquadratic Polynomials. MDPI AG.

Chicago Style (17th ed.) Citation

Cui, Chunfeng, Liqun Qi, and Yi Xu. Positive Semi-Definite and Sum of Squares Biquadratic Polynomials. MDPI AG.

MLA (9th ed.) Citation

Cui, Chunfeng, et al. Positive Semi-Definite and Sum of Squares Biquadratic Polynomials. MDPI AG.