The following paper is well known, but hard to find:

J. Boman, $L^p$-estimates for very strongly elliptic systems, Report 29, Department of Mathematics, University of Stockholm, 1982.

In this paper the so called Boman chain condition has been introduced. However, most of the people who quote this paper have never seen it (including myself). In most of the cases people follow other authors who quote the work of Boman.

Question. Does anyone have a pdf scan of the paper? Is it available anywhere in the internet?

Edit. Thanks to Dan Petersen who made the paper available, another question could be answered: https://mathoverflow.net/a/320747/121665

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    $\begingroup$ Did you already try contacting the Stockholm math department? $\endgroup$ – Nate Eldredge Jan 5 '19 at 20:52
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    $\begingroup$ The have some reports (1998-2012) online in www2.math.su.se/reports. Maybe if you ask them directly as Nate says, the will send you a copy and post it online. $\endgroup$ – EFinat-S Jan 5 '19 at 21:53

I went and scanned it in our library. Here's a Dropbox link. https://www.dropbox.com/s/ks9gdgi0xwl5j65/Boman%20-%20Lp-estimates%20for%20very%20strongly%20elliptic%20systems.pdf?dl=0

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    $\begingroup$ Wow! Thank you so much! $\endgroup$ – Piotr Hajlasz Jan 14 '19 at 13:29

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