Stability of de Sitter and anti-de Sitter universes and canonical superenergy tensors / Janusz Garecki. - Janusz Garecki (Multiverse and fundamental cosmology : proceedings of the conference "Multicosmofun'12", 10-14.09.2012, Szczecin, Poland / eds. Mariusz Przemysław Dąbrowski, Adam Balcerzak, Tomasz Denkiewicz., 2013)
Keywords: conformally flat coordinates; conformally flat spacetimes; energy-momentum complexes; Frieman universes