Our main interest is the existence of maximal compact normal subgroups of locally compact topological groups and its relation to compactly generated subgroups. If a topological group G has a compact ...

A. Karrass, D. Solitar, The Subgroups of a Free Product of Two Groups with an Amalgamated Subgroup, Transactions of the American Mathematical Society, Vol. 150, No. 1 (Jul., 1970), pp. 227-255 ...