并列题名：Design and implementation of the 4.4BSD operating system 并列题名：The Design and Implementation of the 4.4BSD Operating System 并列题名：The Design and Implementation of the 4.4 BSD Operating System 并列题名：Design and implementation of the freeBSD operating system 并列题名：Design and implementation of the FreeBSD operating system Design and implementation of the 4.4BSD operating system The Design and Implementation of the 4.4BSD Operating System The Design and Implementation of the 4.4 BSD Operating System Design and implementation of the FreeBSD operating system Design and implementation of the freeBSD operating system