\providecommand{\newblock}{}
\begin{thebibliography}{10}
\expandafter\ifx\csname url\endcsname\relax
  \def\url#1{{\tt #1}}\fi
\expandafter\ifx\csname urlprefix\endcsname\relax\def\urlprefix{URL }\fi
\providecommand{\eprint}[2][]{\url{#2}}
% Bibliography created with iopart-num v2.1
% /biblio/bibtex/contrib/iopart-num

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Hillas A~M 1984 {\em Ann. Rev. Astron. Astrophys.\/} {\bf 22} 425--444

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Ptitsyna K~V and Troitsky S~V 2010 {\em Phys. Usp.\/} {\bf 53} 691--701
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\bibitem{Abbasi:2018zio}
Abbasi R~U {\em et~al.\/} (Telescope Array) 2018 {\em Astrophys. J.\/} {\bf
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\bibitem{Bellido:2017cgf}
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\bibitem{Homola:2018gre}
Homola P (Pierre Auger) 2018 {\em CERN Proc.\/} {\bf 1} 283 (\textit{Preprint}
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\bibitem{Abbasi:2018ywn}
Abbasi R~U {\em et~al.\/} (Telescope Array) 2019 {\em Astropart. Phys.\/} {\bf
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\bibitem{Zas:2017xdj}
Zas E (Pierre Auger) 2018 {\em PoS\/} {\bf ICRC2017} 972 [,64(2017)]

\bibitem{Abbasi:2019fmh}
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Gelmini G~B, Kalashev O and Semikoz D~V 2012 {\em JCAP\/} {\bf 1201} 044
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\bibitem{Takahashi:2011zzd}
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\bibitem{dropout}
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\bibitem{adadelta}
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\bibitem{hyperopt}
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\end{thebibliography}
