a) where the names of one or more (but not all) of the authors arc pseudonymous and his or their identity is not disclosed,as references to the author whose name is not a pseudonym,or,if the names of two or more of the authors are not pseudonyms,as references to such of those authors who dies last; (b) where the names of one or more (but not all) of the authors arc pseudonyms and the identity of one or more of them is disclosed,as references to the author who dies last from amongst the authors whose names are not pseudonyms and the authors whose names are pseudonyms and are disclosed; and (c) where the names of all the authors arc pseudonyms and the identity of one of them is disclosed,as references to the author whose identity is disclosed or if the identity of two or more of such authors is disclosed,as references to such of those authors who dies last