Warning: XSLTProcessor::transformToXml() [xsltprocessor.transformtoxml]: I/O warning : failed to load external entity "file:////srv-new/scielo/www/bases/xml/pyf/v45/2078-8452-pyf-45-E15.xml" in /srv-new/scielo/www/htdocs/class.XSLTransformerPHP5.php on line 36 Sustainability in peasant farms of the Perico municipality, Matanzas, Cuba