00253nam a2200121   45000010006000000050017000069000010000231000032000332450014000657730028000799420007001079990017001145193020260918151425.0  a18411  aBÁTIZ VÁZQUEZ, Bernardo  aEditorial  gNúm.68 (1999) 3-4 pp.  c16  c51930d51930