APA (7th ed.) Citation

Bastos, N., Ferreira, R., & Torres, D. (1000). 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. 1000.

MLA (8th ed.) Citation

Bastos, N.R.O, et al. Discrete-time Fractional Variational Problems. 1000.