diff --git a/README.md b/README.md
index c5c5458..31097e7 100644
--- a/README.md
+++ b/README.md
@@ -49,5 +49,8 @@ Adaptation and Learning in Control and Signal Processing, 2013
 
 2. Sharkh S. M., Hendijanizadeh2 M., Moshrefi-Torbati3 M., Abusara M. A.: A Novel Kalman Filter Based Technique for Calculating the Time History of Vertical Displacement of a Boat from Measured Acceleration, [Marine Engineering Frontiers Volume 2, 2014](https://www.researchgate.net/profile/Mehdi-Hendijanizadeh/publication/264713649_A_Novel_Kalman_Filter_Based_Technique_for_Calculating_the_Time_History_of_Vertical_Displacement_of_a_Boat_from_Measured_Acceleration/links/53ec88db0cf24f241f1584c5/A-Novel-Kalman-Filter-Based-Technique-for-Calculating-the-Time-History-of-Vertical-Displacement-of-a-Boat-from-Measured-Acceleration.pdf "Marine Engineering Frontiers Volume 2, 2014")
 
-3. Trochoidal Wave [Wikipedia](https://en.wikipedia.org/wiki/Trochoidal_wave)
+3. Daniel Lemire, [Streaming Maximum-Minimum Filter Using No More than 
+Three Comparisons per Element](http://arxiv.org/abs/cs.DS/0610046). Nordic Journal of Computing, 13 (4), pages 328-339, 2006.
+
+4. Trochoidal Wave [Wikipedia](https://en.wikipedia.org/wiki/Trochoidal_wave)