Angular UI-Router multiple views

I find the example on the official GitHub wiki to be very unintuitive. Here is a better one:

https://scotch.io/tutorials/angular-routing-using-ui-router

For instance:

...

.state('bulletinBoard', {
    url: '/bulletinBoard',
    views: {

        // the main template will be placed here (relatively named)
        '': { templateUrl: '../src/app/bulletinBoard/views/bulletinBoard.part.html' },

        // the child views will be defined here (absolutely named)
        'tradeFeed@bulletinBoard': { template: ..... },

        // another child view
        'newsFeed@bulletinBoard': { 
            templateUrl: ......
        }
    }

});

The syntax of each view attribute being viewName@stateName.