APA (7th ed.) Citation

Filippakis, M., Papageorgiou, N., & Staicu, V. (1000). Positive solutions for nonlinear periodic problems.

Chicago Style (17th ed.) Citation

Filippakis, Michael, Nikolaos Papageorgiou, and Vasile Staicu. Positive Solutions for Nonlinear Periodic Problems. 1000.

MLA (8th ed.) Citation

Filippakis, Michael, et al. Positive Solutions for Nonlinear Periodic Problems. 1000.