docs: add missing reference

Signed-off-by: Athan <kgryte@gmail.com>

Author: kgryte

lib/node_modules/@stdlib/stats/base/ndarray/smeankbn/README.md

@@ -79,7 +79,6 @@ The function has the following parameters:
 ## Notes
 
 -   If provided an empty one-dimensional ndarray, the function returns `NaN`.
--   The Kahan–Babuška algorithm is a variant of Kahan summation which provides improved numerical stability and accuracy compared to conventional summation, particularly when summing large numbers of floating-point values.
 
 </section>
 
@@ -111,6 +110,18 @@ console.log( v );
 
 <!-- /.examples -->
 
+* * *
+
+<section class="references">
+
+## References
+
+-   Neumaier, Arnold. 1974. "Rounding Error Analysis of Some Methods for Summing Finite Sums." _Zeitschrift Für Angewandte Mathematik Und Mechanik_ 54 (1): 39–51. doi:[10.1002/zamm.19740540106][@neumaier:1974a].
+
+</section>
+
+<!-- /.references -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">
@@ -125,6 +136,8 @@ console.log( v );
 
 [arithmetic-mean]: https://en.wikipedia.org/wiki/Arithmetic_mean
 
+[@neumaier:1974a]: https://doi.org/10.1002/zamm.19740540106
+
 </section>
 
 <!-- /.links -->