1
by Wallis, S.
Published in World Tunnelling (1997)
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2
by Wallis, A.
Published in Electrotechnology, London (1997)
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4
by Wallis, A.
Published in Electrotechnology, London (1997)
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6
by Wallis, S.
Published in World Tunnelling (1997)
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7
by Wallis, S.
Published in World Tunnelling (1996)
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8
9
by Wallis, S.
Published in World Tunnelling (1996)
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10
11
by Wallis, S.
Published in World Tunnelling (1994)
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13
by Wallis, S.
Published in World Tunnelling (1994)
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15
by Wallis, S.
Published in World Tunnelling (1993)
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16
by Wallis, S.
Published in World Tunnelling (1993)
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17
19
by Wallis
Published in Die Aktiengesellschaft (1971)
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20
by Wallis
Published in Die Aktiengesellschaft (1969)
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