ALLEN, P., BÖTTCHER, J., HLADKÝ, Jan, PIGUET, D. An extension of Turán's theorem, uniqueness and stability. Electronic Journal of Combinatorics. 2014, 21(4), P4.5. ISSN 1077-8926. E-ISSN 1077-8926. Dostupné z: http://www.combinatorics.org/ojs/index.php/eljc/article/view/v21i4p5