Помогите, пожалуйста, найти статью: Maria-Elena Eleftheriou, Josef Novosad, David J. Williams and J. Derek Woollins "Reactions of 1,3-epithionaphtho[1,8-cd][1,25,65]thiadiphosphinine-1,3-dithione; the preparation and X-ray structure of NpP(S)(SMe)SP(S)(OMe), the first C3P2S ring", Journal of the Chemical Society, Chemical Communications 1991, 116 - 117.