Peru's government has significantly reduced the protected area around its famed Nazca Lines, a move critics and archaeologists fear could leave the ancient geoglyphs vulnerable to hundreds of nearby ...

School of Mathematical Sciences, Hebei Normal University, No. 20 Road East. 2nd Ring South, Yuhua District, Shijiazhuang, Hebei, 050024 China Center For Topology and Geometry Based Technology, Hebei ...