Published articles references disappeared

Hello, I hope you can help me. After successfully upgrading to version from all post references disappeared. When editing submission, the reference field is empty. How can I solve that?
Within databases in the table citations I could verify that they are found.

Hi @analia.s

Have you tried rebuilding your citations? If you have command line access you can run:

php lib/pkp/tools/parseCitations.php all

From inside your ojs directory.