Classic Maya Bloodletting and the Cultural Evolution of Religious Rituals: Quantifying Patterns of Variation in Hieroglyphic Texts Munson, Jessica ; Amati, Viviana ; Collard, Mark ; Macri, Martha J. Abstract Publication: PLoS ONE Pub Date: September 2014 DOI: 10.1371/journal.pone.0107982 Bibcode: 2014PLoSO...9j7982M