References display in spbasic style

Question

I am using spbasic for typesetting a Springer Journal paper. References as listed inconsistently when they are listed. dot and space are missing after the author year format when author names have et al. in it. Following figure shows the inconsistency.

I am using

\documentclass[referee]{svjour3}

My question is how to get dot and space after the starting author et al. (year) citation style

Answer 1

Here's an excerpt from the header of the file spbasic.bst:

%% For use with the natbib package (see below). Default is author-year citations. %%
%%   When citations are numbered, please use \usepackage[numbers]{natbib}.        %%

In short, one must load the natbib citation management package in on wishes to employ the spbasic bibliography style correctly.

If you wish to generate numeric-style citation call-outs, be sure to load the natbib package with the option numbers:

\usepackage[numbers]{natbib}

---

Addendum: Here's a full-fledged minimum working example, which employs the natbib package. Note that the citation call-outs are not repeated at the start of each formatted bib entry. I've highlighted the citation call-outs as well as the formatted name blocks in the bib entries.

\documentclass[referee]{svjour3}
\begin{filecontents}[overwrite]{mybib.bib}
% see https://dl.acm.org/doi/abs/10.1145/1282040.1282058 and
%     https://dl.acm.org/doi/10.5555/1018435.1021693
@inproceedings{avw:2007, 
author = {Adamo-Villani, Nicoletta and Wright, Kelly},
title = {{SMILE}: An Immersive Learning Game for Deaf and Hearing Children},
year = {2007},
isbn = {9781450318303},
publisher = {Association for Computing Machinery},
address = {New York, NY, USA},
url = {https://doi.org/10.1145/1282040.1282058},
doi = {10.1145/1282040.1282058},
booktitle = {ACM SIGGRAPH 2007 Educators Program},
pages = {17–es},
keywords = {virtual reality, 3D animation, virtual learning environments, sign language education},
location = {San Diego, California},
series = {SIGGRAPH '07}
}
@inproceedings{avdm:2004,
author = {Adamo-Villani, Nicoletta and Doublestein, John and Martin, Zachary},
title  = {The {MathSigner}: An Interactive Learning Tool for {American Sign Language} {K-3} Mathematics},
year   = {2004},
isbn   = {0769521770},
publisher = {IEEE Computer Society},
address = {USA},
booktitle = {Proceedings of the Information Visualisation, Eighth International Conference},
pages   = {713–716},
numpages = {4},
series  = {IV~'04}
}
\end{filecontents}

\usepackage[T1]{fontenc}
\usepackage[authoryear]{natbib}
\bibliographystyle{spbasic}
\usepackage{microtype} % optional
\usepackage{xurl}
\usepackage[colorlinks,allcolors=blue]{hyperref}
\hyphenation{double-stein}

\begin{document}
\cite{avw:2007}, \cite{avdm:2004}
\bibliography{mybib}
\end{document}