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The requested URL /www.ots.ac.cr/tropiweb/intpages/vols/vol59-1.html 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