Have a look at the 2016 Searchmetrics Universal Infographic, including Extended Search elements as a highlight.
Universal & Extended Search 2016: the Infographic
For the first time we examined types of Extended Search in addition to the Universal Search Integrations in our study – including Knowledge Graph, Direct Answer and Mobile App Pack integrations. Our infographic identifies the key results at a glance.
You want to read the complete Universal & Extended Search Study?