PMID 11983901. doi:10.1073/pnas.052125199. Matsuoka,, Yoshihiro. Earliest Directional Evolution for Microsatellite Size in Maize (PDF). Science. 2003-01-22

球面

亚历山大带角球（英语：Alexander horned sphere）天球图（英语：Celestial spheres）立方體曲率方向统计（英语：Directional statistics）球冠戴森球手与反射的球（英语：Hand with Reflecting Sphere），M·C·艾雪自画像绘图说明镜面球体的反射和光学性质

亚历山大·舒尔金

Psychedelic Drugs 9: 171-172. 94 1977. with Nichols, D. E., and D. C. Dyer. "Directional lipophilic character in a series of psychotomimetic phenethylamine derivatives"

DIN标准列表

Concepts - Part 1: Classification Lubrication 现行 DIN 24340-2 Hydraulic valves; mounting surfaces and connecting plates for directional control valves 现行

Found in articles

玉米

PMID 11983901. doi:10.1073/pnas.052125199. Matsuoka,, Yoshihiro. Earliest Directional Evolution for Microsatellite Size in Maize (PDF). Science. 2003-01-22

球面

亚历山大·舒尔金

Psychedelic Drugs 9: 171-172. 94 1977. with Nichols, D. E., and D. C. Dyer. "Directional lipophilic character in a series of psychotomimetic phenethylamine derivatives"

DIN标准列表

Concepts - Part 1: Classification Lubrication 现行 DIN 24340-2 Hydraulic valves; mounting surfaces and connecting plates for directional control valves 现行