Authors: Kieboom, R.W. Jixiang, Chen

Citation: Kieboom, R.w et Jixiang, Chen, On FWHEP, Acta Mathematica Sinica, New Series Chinese Journal of Mathematics, 10(3), 1994, pp. 301-307

Authors: Jixiang, Chen

Citation: Jixiang, Chen, A Fibration of Categories over Hb, Acta Mathematica Sinica, New Series Chinese Journal of Mathematics, 13(4), 1997, pp. 553-562