APA (7th ed.) Citation

Engl, H. W. (1987). Inverse and ill-posed Problems. Acad. Pr.

Chicago Style (17th ed.) Citation

Engl, Heinz W. Inverse and Ill-posed Problems. Boston <<[u.a.]>>: Acad. Pr, 1987.

MLA (9th ed.) Citation

Engl, Heinz W. Inverse and Ill-posed Problems. Acad. Pr, 1987.