H-principle for 4-dimensional contact foliations
  In this article we introduce the topological study of codimension-1 foliations which admit contact or symplectic structures on the leaves. A parametric existence h-principle for foliated contact structures is provided for any cooriented foliation in a closed oriented 4-fold. 
Roger Casals, Alvaro del Pino, Francisco Presas
math.SG