fix refs

sphinx_docs/source/refs.bib

@@ -669,7 +669,6 @@ @article{langanke:2001
 year = {2001},
 issn = {0092-640X},
 doi = {https://doi.org/10.1006/adnd.2001.0865},
-url = {https://www.sciencedirect.com/science/article/pii/S0092640X01908654},
 author = {K. LANGANKE and G. MARTÍNEZ-PINEDO},
 abstract = {The weak interaction rates in stellar environments are computed for pf-shell nuclei in the mass range A=45–65 using large-scale shell-model calculations. The calculated capture and decay rates take into consideration the latest experimental energy levels and log ft-values. The rates are tabulated at the same grid points of density and temperature as those used by Fuller, Fowler, and Newman for densities ρY e =10–1011 g/cm3 and temperatures T=107–1011 K, and hence are relevant for both types of supernovae (Type Ia and Type II). Effective 〈ft〉 values for capture rates and average neutrino (antineutrino) energies are also given to facilitate the use of interpolated rates in stellar evolution codes.}
 }