getUserId(authorName)
Returns author ID by searching for authorName at https://scholar.google.com/citations?view_op=search_authors.
If more than one author matches authorName, then the first one of the list is chosen.
If there is no match then an error is thrown.
getArticlesURL(authorName)
Returns a list of all the article URLs in authorName's profile.
getArticlesFromURLs(authorName)
Returns an array of Article objects with all the information of each article in authorName's profile.