the RH negative blood type more prevalent in certain ethnic groups?. MadSciNetwork. March 21, 2001 [2017-04-28]. (原始内容存档于2011-06-06). Touinssi, Mhammed;
[2008-12-28]. (原始内容存档于2010-02-24). Sethi, Ricky J. 为什么杯中的粒子向中间移动而非外部边缘?. MadSciNetwork. September 30, 1997 [2008-12-29]. (原始内容存档于2016-03-04). Booker, John
of the role of anthocyanins in hydrangea coloration Anthocyanins FAQ MadSciNetwork (页面存档备份,存于互联网档案馆) Functions and uses as pH indicators or for pigment