how to add cite paper in Springer?

I want to add some cites in Springer journal paper in the following way, but it never works. namely: ? ?

Tex file

\RequirePackage{fix-cm}
%

%\documentclass{svjour3}                     % onecolumn (standard format)
%\documentclass[smallcondensed]{svjour3}     % onecolumn (ditto)
\documentclass[smallextended]{svjour3}       % onecolumn (second format)
%\documentclass[twocolumn]{svjour3}          % twocolumn
%
\smartqed  % flush right qed marks, e.g. at end of proof
%
\usepackage{graphicx}
\usepackage{natbib}

\begin{document}

\citep{Hvala}, \citep{Birkenmeier}

\bibliographystyle{spbasic}
\bibliography{litera}   % name your BibTeX data base

\end{document}
% end of file template.tex


Bib file

@article{Hvala,
author = {Hvala, B.},
title = {Generalized derivations in rings},
journal = {Comm. Algebra},
volume = 26,
pages = {1147--1166},
year = 1998,
}
@inproceedings{Birkenmeier,
author = {Birkenmeier, G. F. and Heatherly, H. E. and Lee, E. K.},
title = {Completely prime ideals and radicals in Near-rings},
booktitle = {Proceedings of Near-rings and Near-Fields},
publisher = {Kluwer},
year = 1995,
pages = {63--73},
editor = {Fong, Y. and others},
}


• You should compile with : pdflatex, bibtex and then pdflatex twice... Did you? – koleygr Mar 4 '19 at 7:27
• Mhhh, the example works for me if I compile it with the usual cycle LaTeX, BibTeX, LaTeX, LaTeX (tex.stackexchange.com/q/63852/35864). Do you get any errors or warnings when you run LaTeX or BibTeX? Can you attach the .blg file? – moewe Mar 4 '19 at 7:29
• If it says nothing more that is a good sign. After two additional LaTeX runs the example should give the expected output. Does the LaTeX run throw additional errors or warnings? Can you check that the .bbl file contains a thebibliography environment and two \bibitems? – moewe Mar 4 '19 at 7:38