Guessab, A.; Schmeisser, G. (2013). «Necessary and sufficient conditions for the validity of Jensen's inequality». Archiv der Mathematik. 100 (6): 561–570. MR3069109. doi:10.1007/s00013-013-0522-3
Guessab, A.; Schmeisser, G. (2013). «Necessary and sufficient conditions for the validity of Jensen's inequality». Archiv der Mathematik. 100 (6): 561–570. MR3069109. doi:10.1007/s00013-013-0522-3