Mathematical circles : (Russian experience) /
Fomin, D. V.(Dmitriĭ Vladimirovich)
Genkin, Dmitriĭ Mikhaĭlovich,1884-
Itenberg, I. V.(Ilʹi︠a︡ Vladimirovich)
Providence, R.I. : American Mathematical Society,
c1996.
Includes bibliographical references (p. 269-272)
Mathematical recreations.