Google page rank algorithm, also known as PR, seems to give more importance to the impact of a scientific paper rather than she is giving the number.

For those who do not know, traditionally, to measure the importance of an item that the method is to "quote number", ie, every time that this article has been cited by other person. The idea is that if many different people cite an article, this means that this article is worthwhile and important. Well, apparently Google looks not only that, but also the content of the article.

Researchers have found that Google's algorithm, to measure the importance of a website, provides a systematic method to find important items. Google's index was better than the traditional method of finding all the good scientific articles that were't very cited by others, but have proven to be a very high value.

Sidney Redner and Pu Chen of Boston University and Huafeng Xie and Sergei Maslov, Brookhaven National Laboratory found that certain items which proved very influential. As the article by Wigner and Seitz, from 1933 "In the constitution of metallic sodium," now is the content of the University regular book. Another example is the article Gaube, 1963 on "Photon correlation," which received the Nobel Prize last year. These items are not known by the usual algorithm appointment, but the shower very high in google and were given a high PR.

The way that Google does is allow your spider web to deepen the budget and see how many times the article quotes the first article cited, and so on, which means that if the article cited by the article is of great value thereof also increases in value.