From f705a69da016e19b4ea202c97aea15e0f42ea02b Mon Sep 17 00:00:00 2001
From: GuochenZhou <106387010+GuochenZhou@users.noreply.github.com>
Date: Thu, 18 Jul 2024 21:17:07 +0800
Subject: [PATCH] Update rs.py

---
 pypop7/optimizers/rs/rs.py | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/pypop7/optimizers/rs/rs.py b/pypop7/optimizers/rs/rs.py
index f4109a410..5ec1165f3 100644
--- a/pypop7/optimizers/rs/rs.py
+++ b/pypop7/optimizers/rs/rs.py
@@ -104,6 +104,11 @@ class RS(Optimizer):
     A discussion of random methods for seeking maxima.
     Operations Research, 6(2), pp.244-251.
     https://pubsonline.informs.org/doi/abs/10.1287/opre.6.2.244
+
+    Ashby, W.R., 1952.
+    `Design for a brain: The origin of adaptive behaviour.
+    <https://link.springer.com/book/10.1007/978-94-015-1320-3>`_
+    Springer.
     """
     def __init__(self, problem, options):
         Optimizer.__init__(self, problem, options)