顾及高程二次项的大地水准面与似大地水准面之差距
徐新强,赵德军,楼楠
A GEOID TO QUASIGEOID SEPARATION CONSIDERING 
SECOND ORDER HEIGHT TERMS
Xu Xinqiang, Zhao Dejun,Lou Nan
大地测量与地球动力学 . 2013, (5): 75 -78 .