How to get all attributes of an attribute group in Magento

>> Sometimes you need to display all attributes value of a particular attribute group. Then you can follow this piece of code :
    <ul>
        <?php
            $_product = $productObj;
            $attributesCollection = Mage::getResourceModel('catalog/product_attribute_collection');
            $attributesCollection->setAttributeGroupFilter(27);                    // Here 27 is Attribute Group Id.
            foreach ($attributesCollection as $attribute) {
                    if($attribute->getFrontendInput() == 'select' || $attribute->getFrontendInput() == 'boolean'){
                        echo "<li>".$attribute->getFrontendLabel()." : ".$_product->getAttributeText($attribute->getAttributeCode())."</li>";
                    }else{
                        echo "<li>".$attribute->getFrontendLabel()." : ".$_product->getData($attribute->getAttributeCode())."</li>";
                    }

            }
        ?>
    </ul>