Namawardana, D.G.K.K.; Wanigasekara, G.; Wanninayake, W.T.M.A.P.K.; Jayathilaka, K.M.D.C.; Wijesundera, R.P.; Siripala, W.(Faculty of Science, University of Kelaniya, Sri Lanka, 2020)
Hidaka, M.; Soejima, M.; Wijesundera, R.P.; Soda, M.; Sato, M.; Choi Sun-Hee; Sung, N.E.; Kim, M.G.; Lee, J.M.(Physica Status Solidi b (basic solid state physics), 2006)