Reference 1 : 27 stars Reference 2 : 59 stars Reference 3 : 49 stars Reference 4 : 9 stars Reference 5 : 3 stars Reference 6 : 4 stars Reference 7 : 3 stars Reference 8 : 2 stars Reference 9 : 2 stars Reference 10 : 2 stars Reference 12 : 3 stars Reference 13 : 1 star Reference 14 : 1 star Reference 18 : 1 star Reference 20 : 1 star Reference 30 : 1 star Reference 50 : 1 star Reference 120 : 1 star Reference 181 : 1 star