APA (7th ed.) Citation

Haußmann, W. (1987). Approximation by harmonic functions.

Chicago Style (17th ed.) Citation

Haußmann, Werner. Approximation by Harmonic Functions. Duisburg, 1987.

MLA (9th ed.) Citation

Haußmann, Werner. Approximation by Harmonic Functions. 1987.

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