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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     number = {2},
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     mrnumber = {340859},
     zbl = {0281.31004},
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     url = {http://archive.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. http://archive.numdam.org/item/CM_1974__28_2_203_0/

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