APA (7th ed.) Citation

Freiling, G. (1986). Boundary value problems associated with multiple roots of the characteristic equation.

Chicago Style (17th ed.) Citation

Freiling, Gerhard. Boundary Value Problems Associated with Multiple Roots of the Characteristic Equation. Duisburg, 1986.

MLA (9th ed.) Citation

Freiling, Gerhard. Boundary Value Problems Associated with Multiple Roots of the Characteristic Equation. 1986.

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