author = {D.B. Sullivan and D.W. Allan and D.A. Howe and F.L. Walls},
title = {{Characterization of Clocks and Oscillators}},
url = {http://tf.nist.gov/general/pdf/868.pdf},
url = {tf.nist.gov/general/pdf/868.pdf},
note = "{NIST Technical Note 1337}",
urldate = {1990},
}
...
...
@@ -86,7 +86,7 @@ year={2018},
@online{biblio:CERN,
title = {{European Organization for Nuclear Research (CERN)}},
url = {www.cern.ch/},
howpublished = {\url{https://www.cern.ch/}},
howpublished = {\url{www.cern.ch/}},
abstract = {{CERN}, the European Organization for Nuclear Research, is one of the world’s largest and most respected centres for scientific research. Its business is fundamental physics, finding out what the Universe is made of and how it works.},