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Visiting the above link gives

<api>
−
<error code="internal_api_error_DBQueryError" info="Exception Caught: A database error has occurred
Query: SELECT  page_id,page_title,page_namespace,page_is_redirect,pl_title,pl_namespace  FROM `page`,`pagelinks`  WHERE (pl_from=page_id) AND ((pl_title = 'Twisday' AND pl_namespace = '0') OR (pl_title = 'Tiwes_dæg' AND pl_namespace = '0') OR (pl_title = 'Martis_dies' AND pl_namespace = '0') OR (pl_title = 'Tiu's_Day' AND pl_namespace = '0') OR (pl_title = 'Tuefday' AND pl_namespace = '0'))  ORDER BY pl_namespace, pl_title, pl_from LIMIT 501  
Function: ApiQueryBacklinks::run
Error: 1064 You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 's_Day' AND pl_namespace = '0') OR (pl_title = 'Tuefday' AND pl_ (10.0.0.236)
">


#0 /usr/local/apache/common-local/php-1.5/includes/Database.php(573): Database->reportQueryError('You have an err...', 1064, 'SELECT  page_id...', 'ApiQueryBacklin...', false)
#1 /usr/local/apache/common-local/php-1.5/includes/Database.php(982): Database->query('SELECT  page_id...', 'ApiQueryBacklin...')
#2 /usr/local/apache/common-local/php-1.5/includes/api/ApiQueryBase.php(214): Database->select(Array, Array, Array, 'ApiQueryBacklin...', Array, Array)
#3 /usr/local/apache/common-local/php-1.5/includes/api/ApiQueryBacklinks.php(202): ApiQueryBase->select('ApiQueryBacklin...')
#4 /usr/local/apache/common-local/php-1.5/includes/api/ApiQueryBacklinks.php(90): ApiQueryBacklinks->run()
#5 /usr/local/apache/common-local/php-1.5/includes/api/ApiQuery.php(211): ApiQueryBacklinks->execute()
#6 /usr/local/apache/common-local/php-1.5/includes/api/ApiMain.php(373): ApiQuery->execute()
#7 /usr/local/apache/common-local/php-1.5/includes/api/ApiMain.php(236): ApiMain->executeAction()
#8 /usr/local/apache/common-local/php-1.5/includes/api/ApiMain.php(220): ApiMain->executeActionWithErrorHandling()
#9 /usr/local/apache/common-local/php-1.5/api.php(77): ApiMain->execute()
#10 /usr/local/apache/common-local/live-1.5/api.php(3): require('/usr/local/apac...')
#11 {main}

</error>
</api>


But is fine for other articles (ie Monday)