http://www.josa.ro/docs/josa_2008_1/a.10_GENERALIZATIONS_AND_REFINEMENTS_FOR_BERGSTROM_AND_RADONS_INEQUALITIES.pdf
http://www.mateinfo.ro/reviste-de-matematica/revista-de-matematica-sclipirea-mintii-issn-1716-3615/revista-sclipirea-mintii/1158-revista-de-matematica-sclipirea-mintii-nr-26/file
Generalizations of Mitrinovic inequality
Revista de Matematica REMI, Decembrie, 2020.
Euler inequality - new proof
C-B-S vs. Bergstrom