Authored notes credited to André Massing, identified as André Jürgen Massing by the NTNU profile. Dated 3 October 2021, in the TMA4125/4130/4135 Mathematics 4N/D materials; the university is the host, rather than the author.
Cited passages: André Massing, Numerical solution of ordinary differential equations: One step methods, October 3, 2021, page 1, Example 1.1: Euler and Heun increment functions.