no. 2
On existence in the Cauchy problem for the biharmonic equation
Compositio Mathematica, Tome 28 (1974) no. 2, pp. 203-207 
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     title = {On existence in the {Cauchy} problem for the biharmonic equation},
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     publisher = {Noordhoff International Publishing},
     volume = {28},
     number = {2},
     mrnumber = {340859},
     zbl = {0281.31004},
     language = {en},
     url = {https://www.numdam.org/item/CM_1974__28_2_203_0/}
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Schaefer, Philip W. On existence in the Cauchy problem for the biharmonic equation. Compositio Mathematica, Tome 28 (1974) no. 2, pp. 203-207. https://www.numdam.org/item/CM_1974__28_2_203_0/

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