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   <dim:field mdschema="dc" element="contributor" qualifier="advisor" lang="en_US">Gerald E. Sacks.</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, 1971.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Vita.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Bibliography: leaves 103-106.</dim:field>
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