(DIR) index=books&field-author-exact=Michael Schmalz&rank=-relevance,+availability,-daterank
 (DIR) ref=pd_sim_b_1
 (DIR) ref=pd_sim_b_2
 (DIR) ref=pd_sim_b_3
 (DIR) ref=pd_sim_b_4
 (DIR) ref=pd_sim_b_5