query: #Find articles authored by Paul Erdős
  #SELECT ?article ?articleLabel WHERE{
  #?article wdt:P31 wd:Q13442814;
  #      wdt:P50 wd:Q173746.
  #      SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } }
  
  #Find Paul Erdős co-authors
  #defaultView:Graph
  SELECT ?item ?itemLabel ("7FFF00" as ?rgb) ?article (" " as ?articleLabel) WHERE{
    ?article wdt:P31 wd:Q13442814;
             wdt:P50 wd:Q173746, ?item.
    #FILTER(?item != wd:Q173746)
    ?article wdt:P2093 ?itemname
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } }
  
  #Limit 1000
  
  #defaultView:Graph
  #SELECT ?item1 ?item1Label ("7FFF00" as ?rgb) ?item2 ?item2Label ?article1 (" " as ?article1Label) ?article2 (" " as ?article2Label) WHERE{
  #  ?article1 wdt:P31 wd:Q13442814;
  #           wdt:P50 wd:Q173746, ?item1.
  #  ?article2 wdt:P31 wd:Q13442814;
  #           wdt:P50 ?item1, ?item2.
  #  FILTER(?item1 != ?item2)
  #  SERVICE wikibase:label { bd:serviceParam wikibase:language "en" } }
  
  #Limit 1000