1. R. Isaacs, Differential games. A mathematical theory with applications to warfare and pursuit, control and optimization (John Wiley & Sons, Inc., New York-London-Sydney, 1965)
2. C.F. Roos, Amer. J. Math. 47(3), 163 (1925). DOI 10.2307/2370550. URL
http://dx.doi.org/10.2307/2370550
3. C.F. Roos, Trans. Amer. Math. Soc. 30(2), 360 (1928). DOI 10.2307/1989126. URL
http://dx.doi.org/10.2307/1989126
4. H.F. Bohnenblust, S. Karlin, in Contributions to the Theory of Games, Vol. 1, ed. by H.W. Kuhn, A.W. Tucker (Princeton University Press, Princeton, New Jersey, 1950), pp. 155–160
5. T. Angell, Journal of Optimization Theory and Applications 19(1), 29 (1976)