Before revision:  Consequently, the expected sojourn time of non-purging (n,k) fork-join queues can be approximated with the help of existing approximations for basic fork-join queues.
After revision:  Consequently, existing approximations for basic fork-join queues can be bridged to the approximations for non-purging (n,k) fork-join queues can be approximated with the help of existing approximations for basic fork-join queues.