@inbook{ SAMOS:154-168,

author = { JOSE SAMOS JIMENEZ } ,

title = { DEFINITION OF EXTERNAL SCHEMAS IN OBJECT ORIENTED DATABASES },

booktitle = { OOIS'95 INTERNATIONAL CONFERENCE ON OBJECT ORIENTED INFORMATION SYSTEM },

isbn = { 3-540-76010-5 },

publisher = { SPRINGER-VERLAG },

pages = { 154 - 168 },

year = { 1995 },

}