Error message

Notice: Undefined variable: type in eval() (line 55 of /srv/web/info/movep/modules/php/php.module(80) : eval()'d code).

bibtex

{SLIEM2015

author = SLIEM, Mehdi; SALMI, Nabila; IOUALALEN, Malika;
title = Achieving Scalability of Self-optimizing Multi-tier Systems Performance Prediction;
booktitle = IPAC'2015 ,
address = Batna, Algérie ,
month = Novembre,
year = 2015, }