* {{Citation|last=Sierksma|first=Gerard|last2=Hoogeveen|first2=Han|doi=10.1002/jgt.3190150209|number=2|journal=[[Journal of Graph Theory]]|mr=1106533|pages=223–231|title=Seven criteria for integer sequences being graphic|volume=15|year=1991}}. | * {{Citation|last=Sierksma|first=Gerard|last2=Hoogeveen|first2=Han|doi=10.1002/jgt.3190150209|number=2|journal=[[Journal of Graph Theory]]|mr=1106533|pages=223–231|title=Seven criteria for integer sequences being graphic|volume=15|year=1991}}. |