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The requested URL /img/revistas/ac/v44n2/0377-9424-ac-42-02-81-gf1.png was not found on this server.
Apache/2.2.8 (Ubuntu) PHP/5.2.4-2ubuntu5.27 with Suhosin-Patch mod_ssl/2.2.8 OpenSSL/0.9.8g Server at www.scielo.sa.cr Port 80