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E-book
An Interpretation of Gravitational Anomaly Using New Formulae On Gravity And Repulsion: 新引力斥力公式对引力异常现象的解读
deZhenzhi FengE-book
Apple Of The Sun - The Argument For The Universal Gravitational 'Constant' Not Being Constant: 太阳的苹果--"引力常数G "不为常数的推证
deZhenzhi Feng