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Kobusiak-Prokopowicz M, Spring A.Kobusiak-Prokopowicz M, et al. Among authors: spring a.Wiad Lek. 1993 Oct;46(19-20):720-4.Wiad Lek. 1993.PMID: 7975615Polish.
Spring A, Kobusiak-Prokopowicz M, Negrusz-Kawecka M.Spring A, et al.Pol Merkur Lekarski. 1997 Aug;3(14):50-2.Pol Merkur Lekarski. 1997.PMID: 9480173Clinical Trial.Polish.
Kobusiak-Prokopowicz M, Spring A, Jołda-Mydłowska B, Witkowska M.Kobusiak-Prokopowicz M, et al. Among authors: spring a.Pol Arch Med Wewn. 2001 Jul;106(1):557-65.Pol Arch Med Wewn. 2001.PMID: 11928566Polish.
Bolanowski J, Spring A, Tupikowska G.Bolanowski J, et al. Among authors: spring a.Wiad Lek. 1992 Dec;45(23-24):883-6.Wiad Lek. 1992.PMID: 1345228Polish.
Ponikowski P, Hańczycowa H, Sebzda T, Jurga M, Spring A, Rotter A, Jordanek P.Ponikowski P, et al. Among authors: spring a.Wiad Lek. 1993 Apr;46(7-8):250-4.Wiad Lek. 1993.PMID: 7902632Polish.
Gawlik A, Krasnowska M, Spring A.Gawlik A, et al. Among authors: spring a.Pneumonol Alergol Pol. 1992;60(11-12):64-8.Pneumonol Alergol Pol. 1992.PMID: 1303782Polish.
Witkowska M, Spring A, Kosmala W, Jołda-Mydłowska B.Witkowska M, et al. Among authors: spring a.Pol Arch Med Wewn. 1997 Apr;97(4):333-42.Pol Arch Med Wewn. 1997.PMID: 9411410Clinical Trial.Polish.
Spring A, Jołda-Mydłowska B, Kosmala W, Witkowska M.Spring A, et al.Pol Merkur Lekarski. 1998 Jun;4(24):315-8.Pol Merkur Lekarski. 1998.PMID: 9771014Polish.