On my website, articles for pigeon fanciers are available free of charge. 

Articles for veterinarians and the DIAGNOSE App are subscription-based.

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For vets:

To purchase a subscription, you must register in advance. (“Sign up” button in top menu bar)  Registration is free.  You only need to register once.

After free registration, you can buy a subscription for full access. To do this, you must first log in. After login the top menu bar changes and the “SUBSCRIBTION” button appears.

Subscription options: 

for 1 month:     3.98 $

for 3 months:  3.32 $ / month     – most popular

for 6 months:  2.49 $ / month     – most economical

After the subscription period has expired, the subscription will be cancelled.  Subscription are NOT automatically renewed, but can be re-subscribed at any time.