APA (7th ed.) Citation

Engl, H. W., & Groetsch, C. W. (1987). A higher order approximation technique for restricted linear least-squares problems. Institut für Mathematik.

Chicago Style (17th ed.) Citation

Engl, Heinz W., and Charles W. Groetsch. A Higher Order Approximation Technique for Restricted Linear Least-squares Problems. Linz: Institut für Mathematik, 1987.

MLA (9th ed.) Citation

Engl, Heinz W., and Charles W. Groetsch. A Higher Order Approximation Technique for Restricted Linear Least-squares Problems. Institut für Mathematik, 1987.