diff --git a/cookbook/groupkeypages.php b/cookbook/groupkeypages.php
index 1a67f88..80f8881 100644
--- a/cookbook/groupkeypages.php
+++ b/cookbook/groupkeypages.php
@@ -2,11 +2,17 @@
 
 # return the "key pages" of a group
 # todo
+#	explicit importance via PTVs
+#		existing PTVs startrecall, recall, startprepare, ... (cf MemoryHandling)
+#		dedicated PTV
 # 	http://phpir.com/pagerank-in-php
 # 	http://faculty.ucr.edu/~hanneman/nettext/C10_Centrality.html#Betweenness
 #	check if isset() really is necessary, seems it was avoided in Coeditions
+#	transform as an extension of http://www.pmwiki.org/wiki/PmWiki/CustomPagelistSortOrder
+#		would produce much better integration
 
 function GroupKeyPages($groupname,$selectionmechanism=""){
+	# XXX if the groupname does not exist then should return an empty array
 	$pages = ListPages("/$groupname\./e");
 
 	//note that this could be replaced by proper ListPages call
@@ -24,14 +30,25 @@ function GroupKeyPages($groupname,$selectionmechanism=""){
 			break;
 		default:
 			$keypages = NetworkDegree($b,8); # degree threshold
-	}
+	} # XXX none of those methods leverage PTVs so far
 	return array_unique($keypages);
 }
 
 
 function GenerateNetworkFromList($pagelist){
+	$b = array();
 	foreach ($pagelist as $page) {
-		$content = ReadPage($page,$since=0);
+		//$content = ReadPage($page,$since=0);
+		$content = ReadPage($page,READPAGE_CURRENT);
+		# check if it has PTVs : 
+		$relatedPTVs = array( "startrecall", "recall", "startprepare" );
+		foreach ($relatedPTVs as $PTV){
+			# if so, add the value
+			$PTV_value = PageTextVar($page,$PTV);
+			if ($PTV_value) {
+				$b["$page"]["$PTV"] = $PTV_value;
+			}
+		} # XXX somehow seems to parse the list of pages twice
 		$links = $content["targets"];
 		$links_array = explode(",",$links);
 		foreach ($links_array as $link) {
@@ -122,6 +139,7 @@ function GroupDegreeDistribution($groupname){
 	$pages = CleanPageList($pages,$groupname);
 
 	$b = GenerateNetworkFromList($pages);
+	if (empty($b)) return array();
 
 	$distribution = array_fill(1,10,0);
 	// has no effect