APA (7th ed.) Citation

Babuška, I. (1969). Numerical solution of boundary value problems by the perturbed variational principle.

Chicago Style (17th ed.) Citation

Babuška, Ivo. Numerical Solution of Boundary Value Problems by the Perturbed Variational Principle. College Park, Maryland, 1969.

MLA (9th ed.) Citation

Babuška, Ivo. Numerical Solution of Boundary Value Problems by the Perturbed Variational Principle. 1969.

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