artikel ilmiah

https://docs.google.com/file/d/0B2wN6V3SRIm4N3p0TlMtRkJ6RzA/edit?usp=sharing https://docs.google.com/file/d/0B2wN6V3SRIm4Q3pWMEJzSGVZU3c/edit?usp=sharing https://docs.google.com/file/d/0B2wN6V3SRIm4YnRfWXNQN1VZbjA/edit?usp=sharing https://docs.google.com/presentation/d/1_nCePrSjddOB3CsXcyw6F1We-QZ7KV-q61G-f5N9WKE/edit?usp=sharing