@BOOK{ Book!D - 100326989,
AUTHOR = "/ by Alfred North Whitehead and Bertrand Russell,Whitehead",
TITLE = "Principia mathematica to *56",
LIBRARY= "کتابخانه مرکز تحقیقات بیوشیمی و بیوفیزیک (دانشگاه تهران)",
SUBJECT = "Mathematics -- Philosophy,Logic, Symbolic and mathematical",
URL = "/book/100326989/Principia-mathematica-to-56/"}