According to Wikipedia, a citation or bibliographic citation is a reference to a book, article, web page, or other published item with sufficient detail to identify the item uniquely.
Bad citations are references that are incorrect or incomplete due to author or publisher errors. They can vary from a simple typographical error in the page number to an incorrect journal/book name. The most common errors are an incorrect date of publication or journal name; however, author names are also misspelled fairly regularly.
Try using a combination of author name and/or keywords in the following:
If the author name search comes up with no results, the author name maybe misspelled. Leave off the author name and redo search with a keywords and one other piece of information such as the year or the journal name.