A characterization of finite posets of the width at most three with the fixed point property.
(English).Czechoslovak Mathematical Journal,
vol. 39
(1989),
issue 1,
pp. 120-126
[1] T. S. Fofanova: Characterization of finite posets of the width two with the fixed point property. Summer School on Ordered Sets and Universal Algebra, Donovaly 1985.