Notice: session_start(): Ignoring session_start() because a session is already active in C:\xampp\htdocs\slims\lib\Session\Driver\index.php(2) : eval()'d code(1) : eval()'d code on line 2 Studies in Surface Science and Catalysis 164 BIOCATALYSIS IN OIL REFINING | Perpustakaan Amirullah STIP Jakarta