(S (S (NP (DT The) (NNP December) (NN 2005) (NN study)) (VP (VBD was) (VP (VP (VBN seen) (PP (IN at) (BASENP (DT the) (NN time)))) (PP (IN as) (NP (BASENP (DT a) (JJ major) (NN boost)) (PP (TO to) (NP (BASENP (DT the) (NN credibility)) (PP (IN of) (BASENP (NNP Wikipedia)))))))))) (PERIOD .))