[ACM Press the 18th international conference - Madrid, Spain (2009.04.20-2009.04.24)] Proceedings of the 18th international conference on World wide web - WWW '09 - What's up CAPTCHA?

The file will be sent to your email address. It may take up to 1-5 minutes before you receive it.

The file will be sent to you via the Telegram messenger. It may take up to 1-5 minutes before you receive it.

Note: Make sure you have linked your account to Z-Library Telegram bot.

The file will be sent to your Kindle account. It may take up to 1–5 minutes before you receive it.

Please note: you need to verify every book you want to send to your Kindle. Check your mailbox for the verification email from Amazon Kindle.