APA (7th ed.) Citation

Heikkilä, S., & Seikkala, S. (1983). On functional differential equations with advanced and retarded arguments.

Chicago Style (17th ed.) Citation

Heikkilä, Seppo, and Seppo Seikkala. On Functional Differential Equations with Advanced and Retarded Arguments. Oulu, 1983.

MLA (9th ed.) Citation

Heikkilä, Seppo, and Seppo Seikkala. On Functional Differential Equations with Advanced and Retarded Arguments. 1983.