@BOOK{ Book!D - 98967370,
AUTHOR = "/ by Alfred North Whitehead and Bertrand Russell,Whitehead",
TITLE = "Principia mathematical to 56",
LIBRARY= "کتابخانه مرکزی و مرکز اسناد دانشگاه تهران",
SUBJECT = "Mathematics -- Philosophy,Logic, symbolic and mathematical",
URL = "/book/98967370/Principia-mathematical-to-56/"}