Viewing Shared Outlook Calendars

I have my outlook calendar on my IPAD - no problems. However, how do I see shared calenders? In other words, on my PC, I have my default calendar and two other's calendars. On my PC I can see all three calendars but on my IPAD I only see my default calendar. I have managed to get my wife's Google Calendar on my IPAD which overlays my default calendar. There should be a way to connect my shared calendars since these other people have already shared it to my default Outlook.