<https://startupcanada.ru/kak-otsenivat-stoimost-stratpa-esli-on-eshhe-ne-sdelal-ni-odnoj-prodazhi/#breadcrumb>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<https://startupcanada.ru/kak-otsenivat-stoimost-stratpa-esli-on-eshhe-ne-sdelal-ni-odnoj-prodazhi/>