  In this paper, we exhibit strongly singular maximal abelian subalgebras
living inside certain k-folded tensors of von Neumann group factors. The two
classes of groups under consideration are the free groups of rank greater than
2 and the free product of m>2 groups, all finite and having the same order p>2
(m>p-1). We prove actually more, namely that the unique trace preserving
conditional expectations from these group factors onto their Laplacian
subalgebras are asymptotic homomorphisms, which in turn implies that the
subalgebras are strongly singular masas.
