Hasenöhrl was awarded the Haitinger Prize of the Austrian Academy of Sciences. He wrote in 1904: However, it was shown by Abraham that Hasenöhrl's calculation for the apparent mass was incorrect, so he published another paper in 1905, where he presented Abraham's criticism and corrected his formula to: This was the same relation (as Hasenöhrl noted himself) as for the electromagnetic mass formula given above. Hasenöhrl's results (concerning apparent mass and thermodynamics) by using cavity radiation was further elaborated and criticized by Kurd von Mosengeil (1906/7) who already incorporated Albert Einstein's theory of relativity in his work. A broad outline of relativistic thermodynamics and mass-energy equivalence using cavity radiation was given by Max Planck in 1907. In some additional papers (1907, 1908) Hasenöhrl elaborated further on his 1904-work and concluded that his new results were now in accordance to the theories of Mosengeil and Planck. However, he complained about the fact that Planck (1907) did not mention his earlier 1904-results (like the dependency of apparent mass on temperature). In 1908 Planck wrote that the results of Hasenöhrl's new approach from 1907 were indeed equivalent to those of relativity. Afterwards, several authors gave credit to Hasenöhrl for his 1904 achievements on cavity radiation. Explanations There are different explanations for this result and its deviation from the relativistic formula . Enrico Fermi and others argued that this problem is analogous to the so-called 4/3 problem of electromagnetic mass. That is, if Hasenöhrl had included the shell in his calculations in a way consistent with relativity, the pre-factor of 4/3 would have been 1, so yielding . He could not have done this, since he did not have relativistic mechanics, with which he could model the shell. On the other hand, Stephen Boughn and Tony Rothman in 2011 (and Boughn in 2012), who gave a historical account of different solutions to the problem, argued that the above explanation is insufficient. After providing a complete relativistic description and solution of the cavity problem (in the "constant velocity case" and "slow acceleration case"), they wrote: Hasenöhrl and Einstein The formulas for electromagnetic mass (like those of Hasenöhrl's) were similar to the famous equation for mass–energy equivalence: published by Albert Einstein in September 1905 in the Annalen der Physik —a few editions after Hasenöhrl published his results on cavity radiation. The similarity between those formulas led some critics of Einstein, up until the 1930s, to claim