Unfortunately, that paper is pay-walled by springer.com. On the bright side, the author of that paper, Kenneth H. Hicks, has provided three different explanati

Unfortunately, that paper is pay-walled by springer.com. On the bright side, the author of that paper, Kenneth H. Hicks, has provided three different explanations of pentaquarks here: http://plato.phy.ohiou.edu/~hicks/thplus.html http://plato.phy.ohiou.edu/~hicks/thplus.html They are a bit dated due to the news today, but they're helpful.