query: SELECT ?cnt ?prs (COUNT(?prs) AS ?cntcnt) WITH {
    SELECT ?ref WHERE {
      ?ref pr:P143 wd:Q54919 .
    }
  } AS %t WITH {
    SELECT ?ref (COUNT(?pr) AS ?cnt) (GROUP_CONCAT(STRAFTER(STR(?pr), 'reference/'); separator=', ') AS ?prs) WHERE {
      INCLUDE %t .
      ?ref ?pr [] .
      ?pr ^wikibase:reference [] .
    } GROUP BY ?ref
  } AS %s WHERE {
    INCLUDE %s .
    ?statement prov:wasDerivedFrom ?ref .
    ?item ?any ?statement .
  } GROUP BY ?cnt ?prs ORDER BY DESC(?cnt) 