1. Krotov, D.S., Trades in the Combinatorial Configurations, Proc. XII Int. Seminar on Discrete Mathematics and Its Applications, Moscow, Russia, June 20–25, 2016, Kasim-Zade, O.M., Ed., Moscow: Moscow State Univ., 2016, pp. 84–96.
2. Hedayat, A.S. and Khosrovshahi, G.B., Trades, Handbook of Combinatorial Designs, Colbourn, C.J. and Dinitz, J.H., Eds., Boca Raton: Chapman & Hall, 2007, 2nd ed., pp. 644–648.
3. Khosrovshahi, G.B., Maimani, H.R., and Torabi, R., On Trades: An Update, Discrete Appl. Math., 1999, vol. 95, no. 1–3, pp. 361–376.
4. Krotov, D.S., On the Gaps of the Spectrum of Volumes of Trades, J. Combin. Des., 2018, vol. 26, no. 3, pp. 119–126.
5. Krotov, D.S., Mogilnykh, I.Yu., and Potapov, V.N., To the Theory of q-ary Steiner and Other-Type Trades, Discrete Math., 2016, vol. 339, no. 3, pp. 1150–1157.