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   <dim:field mdschema="dc" element="date" qualifier="issued" lang="en_US">1969</dim:field>
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   <dim:field mdschema="dc" element="description" lang="en_US">Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1969.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Bibliography: leaves 255-257.</dim:field>
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