APA (7th ed.) Citation

Bastos, N. R. O., Ferreira, R. A. C., & Torres, D. F. M. (2014). Discrete-time fractional variational problems.

Chicago Style (17th ed.) Citation

Bastos, N. R. O., R. A. C. Ferreira, and D. F. M. Torres. Discrete-time Fractional Variational Problems. 2014.

MLA (8th ed.) Citation

Bastos, N. R. O., et al. Discrete-time Fractional Variational Problems. 2014.