added ref

Author: kwinkunks

1806_Time-frequency/Natural_signals.ipynb

@@ -558,7 +558,9 @@
   {
    "cell_type": "code",
    "execution_count": 11,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "from scipy.io import wavfile\n",
@@ -634,7 +636,9 @@
   {
    "cell_type": "code",
    "execution_count": 18,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "np.savetxt(f'signals/bat_{fs}Hz.txt', signal, header=header)"
@@ -655,7 +659,11 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "### Landslide in Greenland"
+    "### Landslide in Greenland\n",
+    "\n",
+    "Public domain data from GLISN.\n",
+    "\n",
+    "> Clinton, J. F., M. Nettles, F. Walter, K. Anderson, T. Dahl-Jensen, D. Giardini, A. Govoni, W. Hanka, S. Lasocki, W. S. Lee, D. McCormack, S. Mykkelveit, E. Stutzmann and S. Tsuboi, Real-time geophysical data enhance Earth system monitoring in Greenland, Eos Trans. AGU, 95(2):13-14 DOI 10.1002/2014EO020001, 2014"
    ]
   },
   {
@@ -1897,7 +1905,7 @@
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3",
+   "display_name": "Python [default]",
    "language": "python",
    "name": "python3"
   },
@@ -1911,7 +1919,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.4"
+   "version": "3.6.3"
   }
  },
  "nbformat": 4,