Bicyclic Steiner triple systems. - Rebecca Calahan Zijlstra; Robert B. Gardner (Discret. Math., 1994)

Steiner Triple Systems with Automorphism Type [1, 0, 0, 0, 0, 0, 0, t, 0, ...0, 1, 0, ...0]. - Michael Minic; Rebecca Calahan Zijlstra (Ars Comb., 2003)