The Motorway PPP : case 6.3Ahmad, Salman; Connolly, Ciaran; Demirag, Istemihan SefikManagement control systems2020 / p. 211-215 https://www.mheducation.co.uk/management-control-systems-2e-9781526848314-emea-group https://books.google.ee/books?id=DsovEAAAQBAJ&lpg=PP1&ots=_SdbTRw8Cj&dq=info%3Ay3w-6ODJRv4J%3Ascholar.google.com&lr&pg=PR10#v=onepage&q&f=false