DOC: Clean noncentral chi2 docstring

Remove unnecessary and unhelpful reference

1 files changed, 1 insertions, 10 deletions

diff --git a/numpy/random/mtrand/mtrand.pyx b/numpy/random/mtrand/mtrand.pyx
index c83046e2e..c5e4662d4 100644
--- a/numpy/random/mtrand/mtrand.pyx
+++ b/numpy/random/mtrand/mtrand.pyx
@@ -2328,17 +2328,9 @@ cdef class RandomState:
 
         where :math:`Y_{q}` is the Chi-square with q degrees of freedom.
 
-        In Delhi (2007), it is noted that the noncentral chi-square is
-        useful in bombing and coverage problems, the probability of
-        killing the point target given by the noncentral chi-squared
-        distribution.
-
         References
         ----------
-        .. [1] Delhi, M.S. Holla, "On a noncentral chi-square distribution in
-               the analysis of weapon systems effectiveness", Metrika,
-               Volume 15, Number 1 / December, 1970.
-        .. [2] Wikipedia, "Noncentral chi-squared distribution"
+        .. [1] Wikipedia, "Noncentral chi-squared distribution"
                https://en.wikipedia.org/wiki/Noncentral_chi-squared_distribution
 
         Examples
@@ -2368,7 +2360,6 @@ cdef class RandomState:
         >>> values = plt.hist(np.random.noncentral_chisquare(3, 20, 100000),
         ...                   bins=200, density=True)
         >>> plt.show()
-
         """
         cdef ndarray odf, ononc
         cdef double fdf, fnonc