diff --git a/tutorials/07_pygsp.ipynb b/tutorials/07_pygsp.ipynb
index e9fb2e4..c3f8932 100644
--- a/tutorials/07_pygsp.ipynb
+++ b/tutorials/07_pygsp.ipynb
@@ -4,12 +4,12 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# [NTDS'18] tutorial 7: PyGSP \n",
-    "[ntds'18]: https://github.com/mdeff/ntds_2018\n",
+    "# [NTDS'19] tutorial 7: PyGSP\n",
+    "[ntds'19]: https://github.com/mdeff/ntds_2019\n",
     "\n",
-    "adapted from [NTDS'17](https://nbviewer.jupyter.org/github/mdeff/ntds_2017/blob/outputs/demos/08_pygsp.ipynb)\n",
+    "adapted from [NTDS'17](https://nbviewer.jupyter.org/github/mdeff/ntds_2017/blob/outputs/demos/08_pygsp.ipynb) (by [Michaël Defferrard](https://deff.ch), [EPFL LTS2](https://lts2.epfl.ch))\n",
     "\n",
-    "[Eda Bayram](http://lts4.epfl.ch/bayram), [EPFL LTS4](http://lts4.epfl.ch)\n",
+    "[Eda Bayram](https://lts4.epfl.ch/bayram), [EPFL LTS4](https://lts4.epfl.ch)\n",
     "\n",
     "This is a tutorial on [PyGSP](https://github.com/epfl-lts2/pygsp), a Python package to ease signal processing on graphs.\n",
     "The PyGSP facilitates a wide variety of operations on graphs, like computing their Fourier basis, filtering or interpolating signals, plotting graphs, signals, and filters. The package includes a wide range of graphs and many filter banks. Despite all the pre-defined models, you can easily use a custom graph by defining its adjacency matrix, and a custom filter bank by defining a set of functions in the spectral domain."
@@ -893,9 +893,9 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.6.1"
+   "version": "3.7.3"
   }
  },
  "nbformat": 4,
- "nbformat_minor": 2
+ "nbformat_minor": 4
 }