1. Akivis, M. A., Three-webs of multidimensional surfaces, Trudy Geom. Sem. Inst. Nauchn. Inform., Akad. Nauk SSSR 2 (1969), pp. 7–31 (Russian).
2. Akivis, M. A., Webs and almost-Grassmann structures, Dokl. Akad. Nauk SSSR, 252 (1980), no. 2, pp. 267–270 (Russian); English transi, in Soviet Math. Dokl. 21 (1980), no. 3, pp. 707-709.
3. Akivis, M. A., Webs and almost-Grassmann structures, Sibirsk. Mat. Zh. 23 (1982), no. 6, pp. 6–15 (Russian); English transi, in Siberian Math. J. 23 (1982), no. 6, pp. 763-770.
4. Akivis, M. A., On the differential geometry of a Grassmann manifold, Tensor (N.S.) 38 (1982), pp. 273–282 (Russian).
5. Akivis, M. A. and V. V. Goldberg, Conformai differential geometry and its generalizations. Wiley-Interscience Publication, New York, 1996.