A good article describing the difficulties when two companies work together on innovation. Who will use the result? It's even more difficult if you are a small company working with a big one. https://www.fastcompany.com/40420096/for-startups-the-arrival-of-amazonand8217s-echo-show-is-a-reminder-of-the-risks-of-partnering-with-a-giant

A good article (post) from Product Management Specialists Tolpagorni about the benefits of leveraging on your ecosystem of companies. Check also this post about mapping your partners: http://www.handsonbusinesscooperation.com/2016/11/21/map-partners-business-cooperation/ http://blog.tolpagorni.com/why-you-should-take-care-of-your-product-ecosystem

A good article on the use of Strategic Relationships to evolve your business. Even if it maybe a pure business cooperation, you still need to think through and prepare for the relationship business wise. https://www.fastcompany.com/40414038/how-uber-adidas-and-tesla-use-strategic-relationships-to-get-ahead

Some additional good advice on how to manage a difficult negotiation. As always prepare, listen and keep focused on your objective. https://www.fastcompany.com/40416298/five-tips-for-winning-business-negotiations-with-bullies

Good and detailed advice on how to prepare for a Negotiation. http://www.mindtheproduct.com/2017/04/top-tips-negotiating-stakeholders/