00326nam a2200121Ia 4500082002000000100002300020245005200043260004900095300001800144490003200162500000500194700000500199  a515.35bB814.MS  aBrakke, Kenneth A.  aThe motion of a surface by its mean curvatureb  aNew JerseybPrinceton University Pressc1978  a239p. Figures  aMathematical notesv no. 20  a  a