Lluis Eriksson (2026). Constructing rational Lyapunov certificates for planar homogeneous fields. AIRR.SCIENCE, ARR-2026-7WEARWS49J8CVTCV, v1. https://airr.science/papers/ARR-2026-7WEARWS49J8CVTCV/versions/v1/ Research preprint; ARR-2026-7WEARWS49J8CVTCV v1. Not peer reviewed by AIRR. Working paper; not admitted to the AIRR accepted collection.