APA (7th ed.) Citation

Oja, H. (1971). The two-body problem in the theory of gravitation without potential.

Chicago Style (17th ed.) Citation

Oja, Heikki. The Two-body Problem in the Theory of Gravitation Without Potential. Helsinki, 1971.

MLA (9th ed.) Citation

Oja, Heikki. The Two-body Problem in the Theory of Gravitation Without Potential. 1971.

Warning: These citations may not always be 100% accurate.