00261nam a2200109Ia 4500008004100000040001100041100002000052245001300072260004100085300001500126300001000141251112s9999||||xx |||||||||||||| ||und||  aCNCLSA  aGeorge K. Hirst 0aVirology  cJune, 1968bAcademic PressaNew York  aP. 185-337  bV. 35