  Mark and Paupert devised a general method for obtaining presentations for
arithmetic non-cocompact lattices, $\Gamma$, in isometry groups of negatively
curved symmetric spaces. The method involves a classical theorem of Macbeath
applied to a $\Gamma$-invariant covering by horoballs of the negatively curved
symmetric space upon which $\Gamma$ acts. In this paper, we will discuss the
application of their method to the Picard modular groups,
$\textrm{PU}(2,1;\mathcal{O}_{d})$, when $d=2,11$, and obtain presentations for
these groups, which completes the list of presentations for Picard modular
groups whose entries lie in Euclidean domains, namely those with
$d=1,2,3,7,11$.

Group Theory;Geometric Topology