{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,7]],"date-time":"2025-10-07T05:16:28Z","timestamp":1759814188637},"reference-count":20,"publisher":"EDP Sciences","license":[{"start":{"date-parts":[[2018,3,26]],"date-time":"2018-03-26T00:00:00Z","timestamp":1522022400000},"content-version":"vor","delay-in-days":84,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["EPJ Web Conf."],"published-print":{"date-parts":[[2018]]},"abstract":"<jats:p>We summarize previous work on <jats:italic>b\u0305b\u0305ud<\/jats:italic> four-quark systems in the Born-Oppenheimer approximation and discuss first steps towards an extension to the theoretically more challenging <jats:italic>bb\u0305ud\u0305<\/jats:italic> system. 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