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\begin{bibn}{Barendregt, H.P.}
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\begin{bibn}{Barendregt, J.T.}
\from{1982} {\em De zielenmarkt}, Boom, Meppel.
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\begin{bibn}{Buddhagosa, B.}
\from{1976} {\em Visuddhimagga\/}, The path of purification,  appeared
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\begin{bibn}{Goldstein, J.}
\from{1983}{\em The experience of insight}, Shambhala, Boston, London.
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\begin{bibn}{Hofstadter, D.E.}
\from{1979}{\em G\"odel Escher Bach, an Eternal Golden Braid}, Harvester
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\begin{bibn}{Nagel, E.}
\from{1961}{\em The structure of science}, Routledge, London.
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\begin{bibn}{Penrose, R.}
\from{1989}{\em The emperor's new mind}, Oxford University Press, Oxford.
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\begin{bibn}{Sartre, J.-P.}
\from{1938}{\em La naus\'ee\/}, Gallimard, Paris.
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\begin{bibn}{Staal, F.}
\from{1975}{\em Exploring mysticism}, Penguin.
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\begin{bibn}{Vlug, A.}
\from{1993}{\em Balanceren op de rand van de rede},
with contributions of D.R.~Hofstadter, H.P.~Barendregt,
H.B.G.~Casimir and G.~Zukav, Lemniscaat, Rotterdam.
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\end{references}
