Nielsen, K. L. 1., & Nielsen, K. L. 1. (1966). Differential equations: Basic concepts and theories exercises, examinations, answers (2. edition.). New York, New York: Barnes and Noble.
Chicago Style CitationNielsen, Kaj Leo 1914-, and Kaj Leo 1914- Nielsen. Differential Equations: Basic Concepts and Theories Exercises, Examinations, Answers. 2. edition. New York, New York: Barnes and Noble, 1966.
MLA CitationNielsen, Kaj Leo 1914-, and Kaj Leo 1914- Nielsen. Differential Equations: Basic Concepts and Theories Exercises, Examinations, Answers. 2. edition. New York, New York: Barnes and Noble, 1966.
Warning: These citations may not always be 100% accurate.