On Crossed Modules in Modified Categories of Interest
  We introduce some algebraic structures such as singularity, commutators and central extension in modified categories of interest. Additionally, we introduce the cat$^{1}$-objects with their connection to crossed modules in these categories which gives rise to unify many notions about (pre)crossed modules in various algebras of categories. 
Ahmet Faruk Aslan, Selim \c{C}etin, Enver \"Onder Uslu
math.CT math.RA