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Severity: Notice

Message: Undefined offset: 0

Filename: views/abstract_book.php

Line Number: 70

Backtrace:

File: /home/helicsdev/public_html/application/views/abstract_book.php
Line: 70
Function: _error_handler

File: /home/helicsdev/public_html/application/controllers/Abstract_book.php
Line: 8
Function: view

File: /home/helicsdev/public_html/index.php
Line: 292
Function: require_once

https://helicsgroup.net/abstract_books//abstract_book.pdf" style="font-size:30px;color:#666666;position:absolute;top:50px;right:8px;z-index:999;" title="Download abstract book" download>