Hopf superalgebra structure for Drinfeld super Yangian of Lie superalgebra $B(m,n)$

We construct a Hopf superalgebra structure for a Drinfeld super Yangian of Lie superalgebra $B(m,n)$ relative to all possible choices of Borel subalgebras. In order to do this we introduce a simplified definition of Drinfeld super Yangians.