1.
Green B, Tsuruga M, Scoville NA. Estimating the discrete Lusternik-Schnirelmann category. TMNA [Internet]. 2015 Mar. 1 [cited 2022 Oct. 4];45(1):103-16. Available from: https://apcz.umk.pl/TMNA/article/view/TMNA.2015.006