(a) Nagelli and Kramer
(b) Rabies and rabies
(c) Singer and Sikon
(d) Messen and Sekel
Answer-(a) Nageli and Kramer
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(a) Nagelli and Kramer
(b) Rabies and rabies
(c) Singer and Sikon
(d) Messen and Sekel
Answer-(a) Nageli and Kramer