Okun L., “Relation Between Energy and MASS in Bohr's Essay on His Debate with Einstein”, Phys. Atom. Nuclei, 64:3 (2001), 536–539
Okun L., “A Thought Experiment with Clocks in Static Gravity”, Mod. Phys. Lett. A, 15:32 (2000), 2007–2009
Okun L., “Photons and Static Gravity”, Mod. Phys. Lett. A, 15:31 (2000), 1941–1947
Г. Б. Малыкин, УФН, 170:12 (2000), 1325–1349 ; Phys. Usp., 43:12 (2000), 1229–1252