Sharko, V. V. “<i>L</i><sub>2 </Sub&gt;-Invariants and Morse - Smale Flows on Manifolds”. Ukrains’kyi Matematychnyi Zhurnal 59, no. 4 (April 25, 2007): 522-533. Accessed June 13, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3326.