Factorization of matrices (msc 15A23), Positive matrices and their generalizations; cones of matrices (msc 15B48), Stochastic matrices (msc 15B51)
Logistics (theme 3), Energy (theme 4)
Linear Algebra and its Applications

Picci, G, van den Hof, J.M, & van Schuppen, J.H. (1998). Primes in several classes of the positive matrices. Linear Algebra and its Applications, 277(1-3), 149–185.