. . "Yagyu, K" . "2558440" . "Ohta, S" . . "10.1016/0378-1135(89)90023-0" . . . "PMC7117437" . "els-covid" . "Purification of infectious bronchitis coronavirus by Sephacryl S-1000 gel chromatography" . "Nagano, H" . "66aced2261cbe68a5e2d55c5229b9b45893ee699" . "Veterinary Microbiology" . "2558440" . "1989-12-31"^^ . . . "Elsevier; Medline; PMC" . .