Kurt Singer, Hitlers Weltkrieg 1939-1945, Die Dänische Friedens Akademie. (In German). Retrieved 2010-03-20.
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The reference to Oshima's intervention is in William L. Shirer's The Rise and Fall of the Third Reich. However, according to Eugen Solf, a grandson of Dr. Wilhelm and Hanna Solf who is doing research of his family during the Nazi Period:
"I think the Japanese Government did not intervene, and if it did, the Nazis, or better the Foreign Ministry, did most certainly not react to that request. On 7 July 1944 the attorney Dr Kurt Behling wrote to another attorney about these fruitless attempts. (source: estate of Dr Behling, National Archives, Koblenz, Germany).
On 18 July the Ministry of Justice issued a "Führerinformation" (an information by the "Führer") describing the court case of 1 July, and the fact that the case against Johanna Solf was separated from the other cases because new evidence was found against her. According to the state attorney, the death sentence for Solf had been seriously considered (Führerinformation, RJustMin 1944, Nr 144).
On 24 July Behling wrote a note after a discussion with someone at the Ministry of Justice who said 'the case against Solf is absolutely serious and the death sentence will be seriously considered' (Behling estate, National Archives). By that time the 20 July Plot (Stauffenberg) must have played a serious role in these considerations.
It is therefore more than uncertain that the Japanese Government's possible interventions bore any fruit.
It is by no means certain that the Solf dossier was destroyed when Freisler was killed on 3 February 1945."
