Beniamino Volta and Geoffrey E. Braswell. "Alternative Narratives and Missing Data: Refining the Chronology of Chichen Itza"

https://www.academia.edu/7770526/Beniamino_Volta_and_Geoffrey_E_Braswell_Alternative_Narratives_and_Missing_Data_Refining_the_Chronology_of_Chichen_Itza_