Liu, X.X.LiuGrassi, F.F.GrassiSpadacini, G.G.SpadaciniVande Ginste, DriesDriesVande GinstePignari, S.A.S.A.Pignari2021-10-292021-10-292020https://imec-publications.be/handle/20.500.12860/35490A novel implementation of perturbation technique for better integration of NUTL with periodic geometryProceedings paper