Планкова константа — разлика између измена

* {{Cite book | last = Barrow| first = John D. | authorlink = John D. Barrow| coauthors = | editor = | others = | title = The Constants of Nature; From Alpha to Omega - The Numbers that Encode the Deepest Secrets of the Universe| origdate = | origyear = | origmonth = | url = | format = | accessdate = | accessyear = | accessmonth = | edition = | date = | year = 2002| month = | publisher = Pantheon Books | location = | language = енглеском| id = ISBN 0-375-42221-8 | doi =| pages = | chapter =