OrderBy(Project(Extend(Extend(Extend(Filter(??agg4,
                                            AggregationJoin(Aggregation(??agg1: ?isbn, SAMPLE,
                                                            {},
                                                            G1=Group((?isbn),
                                                               BGP( ?s <http://www.w3.org/ns/oa#hasSource> ??5 .
                                                                ??5 <http://schema.org/url> ?isbn .
                                                                ??5 <http://purl.org/dc/terms/title> ?title))),
                                            Aggregation(??agg2: ?title, SAMPLE,
                                            {}, G1),
                                            Aggregation(??agg3: ?isbn, COUNT,
                                            {}, G1),
                                            Aggregation(??agg4: (count(?isbn)  > 1), EBV,
                                            {}, G1))),
                                     ?isbn,
                                     ??agg1),
                              ?title,
                              ??agg2),
                       ?count,
                       ??agg3),
                {?isbn, ?title, ?count}), (desc (?count)))