APA (7th ed.) Citation

Kallio, H. (1974). Gravitational collapse in the projective theory of relativity.

Chicago Style (17th ed.) Citation

Kallio, Heikki. Gravitational Collapse in the Projective Theory of Relativity. Helsinki, 1974.

MLA (9th ed.) Citation

Kallio, Heikki. Gravitational Collapse in the Projective Theory of Relativity. 1974.

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