by Tzaneva, N, Belova, N, Kirkova, L, Piryova, B
Published in Acta physiologica et pharmacologica Bulgarica (1994)

by Natcheff, N, Avramova, T, Kirkova, L, Tzoncheva, A, Koparanova, O
Published in Acta physiologica et pharmacologica Bulgarica (1994)

by Belova, N, Kirkova, L, Avramova, T, Piryova, B, Natcheff, N, Thurau, K
Published in Acta physiologica et pharmacologica Bulgarica (1995)

by Piryova, B, Natcheff, N, Kirkova, L
Published in Acta physiologica et pharmacologica Bulgarica (1980)

by Pir'ova, B, Nachev, N, Kirkova, L
Published in Fiziologicheskii zhurnal SSSR imeni I. M. Sechenova (01.03.1978)

by Natcheff, N, Piryova, B, Garchev, R, Kirkova, L
Published in Agressologie: revue internationale de physio-biologie et de pharmacologie appliquees aux effets de l'agression (1975)

by Natcheff N, Pyryova B, Garchev R, Kirkova L
Published in Agressologie (1975)