@phdthesis{ SAMOSJIMENEZ:1997,

title = { DEFINITION OF EXTERMAL SCHEMAS AND DERIVED CLASSES IN OBJECT ORIENTED DATABASES },

author = { JOSE SAMOS JIMENEZ },

director = { },

school = { UNIVERSIDAD POLITÉCNICA DE CATALUÑA. LLENGUATGES I SISTEMES INFORMÀTICS },

year = { 1997 },

}