Anisotropy of the mantle inferred from observations of P to S converted waves : Kosarev, G L; Makeyeva, L I; Vinnik, L P Geophys J R Astr Soc V76, N1, Jan 1984, P209–220 (Paper to the Proceedings of the 1st International Workshop on Seismic Anisotropy, Suzdal, 11–19 May 1982)