query: SELECT ?volume ?issue ?startpage (COUNT(*) AS ?c) (GROUP_CONCAT(?qId;SEPARATOR = ", ") AS ?qIds) WHERE {  
    ?item wdt:P1433 wd:Q220370 .
    ?item wdt:P478 ?volume .
    ?item wdt:P433 ?issue .
    ?item wdt:P304 ?pages0 . 
    BIND(replace(?pages0, "-", "–") AS ?pages)
    BIND(if(contains(?pages,  "–"), strbefore(?pages, "–"), ?pages) as ?startpage)
    BIND(str(?item) as ?url)
    BIND(strafter(?url, "http://www.wikidata.org/entity/") as ?qId)  
  }
  GROUP BY ?volume ?issue ?startpage 
  HAVING(?c > 1)
  ORDER BY ASC(xsd:integer(?volume)) ASC(xsd:integer(?issue)) ASC(xsd:integer(?startpage))