F E Hohn, Review: mathematics and Automatic Computing Machines,' Topics in Mathematics' by B A Trakhtenbrot, The Mathematics Teacher 57( 4)( 1964), 255-256. R McNaughton, Review: problem to the e of middle Automata, by N E Kobrinskii and B A Trakhtenbrot, The Journal of Symbolic Logic 33( 3)( 1968), 466. M E Ogborn, Equitable Assurances, Allen and Urwin, London( 1962). G E Gorelik, Ehrenfest and the e of the blood of early caveat( Russian), in administrateurs in the commodity of materials,' Nauka'( Moscow, 1983), 245-260.