Robert M. Corless. What is a solution of an ODE?. ACM Comm. Computer Algebra, 27(4):15-19, 1993. [doi]
@article{Corless93, title = {What is a solution of an ODE?}, author = {Robert M. Corless}, year = {1993}, doi = {10.1145/182125.182129}, url = {http://doi.acm.org/10.1145/182125.182129}, researchr = {https://researchr.org/publication/Corless93}, cites = {0}, citedby = {0}, journal = {ACM Comm. Computer Algebra}, volume = {27}, number = {4}, pages = {15-19}, }