It opened the series of papers of other authors (which were communicated already by R. Aris). The well known papers of this series are the works of Frederick J. Krambeck,[6] Roy Jackson, Friedrich Josef Maria Horn,[7] Martin Feinberg[8] and others, published in the 1970s. In his second "prolegomena" paper,[9] R. Aris mentioned the work of N.Z. Shapiro, L.S. Shapley (1965),[10] where an important part of his scientific program was realized.