Π10 classes and strong degree spectra of relations. - John Chisholm; Jennifer Chubb; Valentina S. Harizanov; Denis R. Hirschfeldt; Carl G. Jockusch Jr.; Timothy H. McNicholl; Sarah Pingrey (J. Symb. Log., 2007)

Partial automorphism semigroups. - Jennifer Chubb; Valentina S. Harizanov; Andrei S. Morozov; Sarah Pingrey; Eric Ufferman (Ann. Pure Appl. Log., 2008)