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https://www.academia.edu/27499598/Gonz%C3%A1lez_Garc%C3%ADa_A_C%C3%A9sar_and_Ivan_%C5%A0prajc_2016_Astronomical_significance_of_architectural_orientations_in_the_Maya_Lowlands_A_statistical_approach_Journal_of_Archaeological_Science_Reports_9_191_202