^. Gxudqg, J1 Pduwlqrw|/ dqg G1 Odqjhylq1 Oltxlg rz wkurxjk dtxhrxv irdpv = Iurp wkh sodwhdx erughu0grplqdwhg uhjlph wr wkh qrgh0 grplqdwhg uhjlph1 Sk|v1, pp.963-967

^. Gxuldq and /. Zhlw}, Pxowlsoh oljkw0vfdwwhulqj surehv ri irdp vwuxfwxuh dqg g|qdplfv1 Vflhqfh/ 585 =9