00658nam a2200181Ia 4500082001900000100003600019245009700055260004300152300001000195490008400205500000500289690000600294700003100300952010100331964001700432921001000449999001700459  a515.35bK96.SL  aKaumpera, A. and Spencer, D. C.  aSystems of linear partial differential equations and deformation of pseudogroup structuresb  aMontrealbUniversite de Montrealc1974  a104p.  aUniversity of Montreal, seminaire de Mathematiques superieures-ETE 1969v v. 41  a  a   aSpencer, D. C. ; jt. auth.  00104070aISIbISId1998-09-25l0o515.35 K96.SLpDP16370r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a13990  c13990d13990