00388nam a2200109Ia 4500008004100000082001700041100002200058245003600080260006200116300001500178490008500193260427b        |||||||| |||| 00| 0 eng d  a512bN147.OF  aNagata, Masayoshi  aOn flat extensions of a ringb/  aMontreal:bLes Presses de L'Universite de Montreal,c1971  a58p. Bibl.  aUniversity of Montreal, Seminaire de Mathematiques superieures, ETE, 1970, v. 46