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This research was supported by the United States Air Force through the Air Force Office of Scientific Research and Development Command under Contract No. AF 49(638)-107.
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Chen, Y.W. Hoelder continuity and initial value problems of mixed type differential equations. Commentarii Mathematici Helvetici 33, 296–321 (1959). https://doi.org/10.1007/BF02565921
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DOI: https://doi.org/10.1007/BF02565921