by Lena, D., Robinson, A., Storchi-Bergman, T., Schnorr-Müller, A., Seelig, T., Riffel, R. A., Nagar, N. M., Couto, G. S., Shadler, L.
Published in The Astrophysical journal (10.06.2015)

by BLANCO, V. M, GREGORY, B, STORCHI-BERGMAN, T, MATTHEWS, J, HAMUY, M, HEATHCOTE, S. R, PHILLIPS, M. M, SUNTZEFF, N. B, TERNDRUP, D. M, WALKER, A. R, WILLIAMS, R. E, PASTORIZA, M. G
Published in The Astrophysical journal (01.09.1987)