diff --git a/repository/Grafoscopio/GrafoscopioNotebook.class.st b/repository/Grafoscopio/GrafoscopioNotebook.class.st
index 23ec3ec..74f0f13 100644
--- a/repository/Grafoscopio/GrafoscopioNotebook.class.st
+++ b/repository/Grafoscopio/GrafoscopioNotebook.class.st
@@ -60,7 +60,9 @@ GrafoscopioNotebook class >> open: aFileReference [
 { #category : #utilities }
 GrafoscopioNotebook >> addCommandFrom: dictionary into: stream [
 	dictionary keysAndValuesDo: [ :k :v |
-		k = 'thisNotebook' ifTrue: [ stream nextPutAll: (self perform: #markdownFileChecksumUpto:  with: 10) ] ]
+		k = 'thisNotebook' 
+			ifTrue: [ 
+				stream nextPutAll: (GrafoscopioUtils perform: v on: self) ]]
 ]
 
 { #category : #'editing nodes' }
@@ -183,7 +185,9 @@ GrafoscopioNotebook >> exportAsLaTeX [
 	I suppose pandoc is already installed and available in the system."
 	| texFile |
 	self markdownFile exists ifTrue: [ self markdownFile delete ].
-	self exportAsMarkdown.
+	"self exportAsMarkdown.""<- This violates the separation of concenrs. Markdown exportation should
+	be explicit. There is still the issue of how to deal with desynchronization between a notebook 
+	which has unsaved changes as markdown.... TO BE REVIWED!"
 	texFile := self markdownFile parent fullName,'/', self markdownFile basenameWithoutExtension, '.tex'.
 	texFile asFileReference exists ifTrue: [ texFile asFileReference delete ].
 	OSProcess command: 'pandoc --standalone ', self markdownFile fullName, ' -o ', texFile.
@@ -203,16 +207,14 @@ GrafoscopioNotebook >> exportAsPDF [
 	"I export the current tree/document to a PDF file, using pandoc and LaTeX external apps.
 	The latex engine used is xelatex, to minimize errors and warnings related with UTF8 support.
 	I suppose all them are already installed and defined in the system."
-	| pdfFile pandocCommand  |
-	self markdownFile exists ifFalse: [ self exportAsMarkdown ].
-	pdfFile := self markdownFile parent fullName,'/', self markdownFile basenameWithoutExtension, '.pdf'.
-	pdfFile asFileReference exists ifTrue: [ pdfFile asFileReference delete ].
-	pandocCommand := 'cd ', self workingFile parent fullName,'; pandoc ', 
-					self pandocOptionsComputed, ' ',
-					self markdownFile fullName, ' -o ', pdfFile.
-	Transcript show: pandocCommand.
+	| pandocCommand  |
+	self markdownFile exists ifFalse: [ self exportAsMarkdown ].	
+	self pdfFile ensureDelete.
+	pandocCommand := 'cd ', self markdownFile parent fullName,'; ',
+		'pandoc ', self pandocOptionsComputed, ' ',
+		self markdownFile fullName, ' -o ', self pdfFile fullName.
 	ExternalUnixOSProcess command: pandocCommand.
-	self inform: ('File exported as: ', String cr, pdfFile)
+	self inform: ('File exported as: ', String cr, self pdfFile fullName)
 ]
 
 { #category : #persistence }
@@ -351,8 +353,11 @@ GrafoscopioNotebook >> markdownFileChecksum [
 ]
 
 { #category : #utilities }
-GrafoscopioNotebook >> markdownFileChecksumUpto: anInteger [ 
-	^ self markdownFileChecksum copyFrom: 1 to: anInteger.
+GrafoscopioNotebook >> markdownFileChecksumUpto: anInteger [
+	"I cut the markdownFileCheckup upto a given integer. 
+	Type coersion is needed, because this message argument can be read from a string in %metadata nodes.
+	Maybe the way used by playgrounds to import text as commands can be useful here."
+	^ self markdownFileChecksum copyFrom: 1 to: anInteger asInteger.
 ]
 
 { #category : #'editing nodes' }
@@ -562,6 +567,15 @@ GrafoscopioNotebook >> pasteNodeFromClipboard [
 	self notebookContent: notebook.
 ]
 
+{ #category : #persistence }
+GrafoscopioNotebook >> pdfFile [
+	"I define the location of the markdown file where the notebook will be exported"
+	| pdfFile |
+	pdfFile := (self markdownFile parent fullName,'/', self markdownFile basenameWithoutExtension, '.pdf') asFileReference.
+	^ pdfFile.
+	
+]
+
 { #category : #initialization }
 GrafoscopioNotebook >> projectSubMenu [