On Linial's Conjecture for Spine Digraphs
  In this paper we introduce a superclass of split digraphs, which we call spine digraphs. Those are the digraphs D whose vertex set can be partitioned into two sets X and Y such that the subdigraph induced by X is traceable and Y is a stable set. We also show that Linial's Conjecture holds for spine digraphs. 
Maycon Sambinelli and C\^andida Nunes da Silva and Orlando Lee
math.CO