A LICHNEROWICZ-TYPE RESULT ON A SEVEN-DIMENSIONAL QUATERNIONIC CONTACT MANIFOLD. Annual of Sofia University St. Kliment Ohridski. Faculty of Mathematics and Informatics, [S. l.], v. 101, p. 193–213, 2013. Disponível em: https://annual.uni-sofia.bg/index.php/fmi/article/view/239. Acesso em: 15 dec. 2025.