00282nam a2200109 a 450000500170000002000150001708200200003210000230005224500350007526000380011030000240014820251203110108.0  a9810225202  a530.155353bPRA  aPrastaro, Agostino  aGeometry of PDEs and mechanics  aSingaporebWorld scientificc1996  ax,750p.c23 cm H.B.